| Rfc | 4008 |
|---|
| Title | Definitions of Managed Objects for Network Address Translators
(NAT) |
|---|
| Author | R. Rohit, P. Srisuresh, R. Raghunarayan, N. Pai, C. Wang |
|---|
| Date | March 2005 |
|---|
| Format: | TXT, HTML |
|---|
| Obsoleted by | RFC7658 |
|---|
| Status: | PROPOSED STANDARD |
|---|
|
Network Working Group R. Rohit
Request for Comments: 4008 Mascon Global Limited
Category: Standards Track P. Srisuresh
Caymas Systems, Inc.
R. Raghunarayan
N. Pai
Cisco Systems, Inc.
C. Wang
Bank One Corp
March 2005
Definitions of Managed Objects for Network Address Translators (NAT)
Status of This Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2005).
Abstract
This memo defines a portion of the Management Information Base (MIB)
for devices implementing Network Address Translator (NAT) function.
This MIB module may be used for configuration as well as monitoring
of a device capable of NAT function.
Table of Contents
1. Introduction ................................................. 2
2. The Internet-Standard Management Framework ................... 2
3. Terminology .................................................. 3
4. Overview ..................................................... 4
4.1. natInterfaceTable....................................... 4
4.2. natAddrMapTable......................................... 5
4.3. Default Timeouts, Protocol Table, and Other Scalars..... 6
4.4. natAddrBindTable and natAddrPortBindTable............... 6
4.5. natSessionTable......................................... 6
4.6. RFC 3489 NAPT Variations, NAT Session and Bind Tables... 7
4.7. Notifications........................................... 7
4.8. Relation Among Tables................................... 8
4.9. Configuration via the MIB............................... 8
4.10. Relationship to Interface MIB........................... 9
5. Definitions .................................................. 9
6. Acknowledgements ............................................. 59
7. Security Considerations ...................................... 59
8. References ................................................... 60
Authors' Addresses ............................................... 62
Full Copyright Statement.......................................... 64
1. Introduction
This memo defines a portion of the Management Information Base (MIB)
for devices implementing NAT function. This MIB module may be used
for configuration and monitoring of a device capable of NAT function.
NAT types and their characteristics are defined in[RFC2663].
Traditional NAT function, in particular is defined in [RFC3022].
This MIB does not address the firewall functions and must not be used
for configuring or monitoring these. Section 2 provides references
to the SNMP management framework, which was used as the basis for the
MIB module definition. Section 3 describes the terms used throughout
the document. Section 4 provides an overview of the key objects,
their inter-relationship, and how the MIB module may be used to
configure and monitor a NAT device. Lastly, section 5 has the
complete NAT MIB definition.
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119].
2. The Internet-Standard Management Framework
For a detailed overview of the documents that describe the current
Internet-Standard Management Framework, please refer to section 7 of
RFC 3410 [RFC3410].
Managed objects are accessed via a virtual information store, termed
the Management Information Base or MIB. MIB objects are generally
accessed through the Simple Network Management Protocol (SNMP).
Objects in the MIB are defined using the mechanisms defined in the
Structure of Management Information (SMI). This memo specifies a MIB
module that is compliant to the SMIv2, which is described in STD 58,
RFC 2578 [RFC2578], STD 58, RFC 2579 [RFC2579] and STD 58, RFC 2580
[RFC2580].
3. Terminology
Definitions for a majority of the terms used throughout the document
may be found in RFC 2663 [RFC2663]. Additional terms that further
classify NAPT implementations are defined in RFC 3489 [RFC3489].
Listed below are terms used in this document.
Address realm - An address realm is a realm of unique network
addresses that are routable within the realm. For example, an
enterprise address realm could be constituted of private IP addresses
in the ranges specified in RFC 1918 [RFC1918], which are routable
within the enterprise, but not across the Internet. A public realm
is constituted of globally unique network addresses.
Symmetric NAT - Symmetric NAT, as defined in RFC 3489 [RFC3489], is a
variation of Network Address Port Translator (NAPT). Symmetric NAT
does not use port bind for translation across all sessions
originating from the same private host. Instead, it assigns a new
public port to each new session, irrespective of whether the new
session used the same private end-point as before.
Bind or Binding - Several variations of the term 'Bind' (or
'Binding') are used throughout the document. Address Bind (or
Address Binding) is a tuple of (Private IP address, Public IP
Address) used for translating an IP address end-point in IP packets.
Port Bind (or, Port Binding, or Address Port Bind, or Address Port
Binding) is a tuple of (transport protocol, Private IP address,
Private port, Public IP Address, Public port) used for translating a
port end-point tuple of (transport protocol, IP address, port). Bind
is used to refer to either Address Bind or Port Bind. Bind Mode
identifies whether a bind is Address Bind or Port Bind.
NAT Session - A NAT session is an association between a session as
seen in the private realm and a session as seen in the public realm,
by virtue of NAT translation. If a session in the private realm were
to be represented as (PrivateSrcAddr, PrivateDstAddr,
TransportProtocol, PrivateSrcPort, PrivateDstPort) and the same
session in the public realm were to be represented as (PublicSrcAddr,
PublicDstAddr, TransportProtocol, PublicSrcPort, PublicDstPort), the
NAT session will provide the translation glue between the two session
representations. NAT sessions in the document are restricted to
sessions based on TCP and UDP only. In the future, NAT sessions may
be extended to be based on other transport protocols such as SCTP,
UDP-lite and DCCP.
The terms 'local' and 'private' are used interchangeably throughout
the document when referring to private networks, IP addresses, and
ports. Likewise, the terms 'global' and 'public' are used
interchangeably when referring to public networks, IP addresses, and
ports.
4. Overview
NAT MIB is configurable on a per-interface basis and depends in
several parts on the IF-MIB [RFC2863].
NAT MIB requires that an interface for which NAT is configured be
connected to either a private or a public realm. The realm
association of the interface plays an important role in the
definition of address maps for the interface. An address map entry
identifies the orientation of the session (inbound or outbound to the
interface) for which the entry may be used for NAT translation. The
address map entry also identifies the end-point of the session that
must be subject to translation. An SNMP Textual-Convention
'NatTranslationEntity' is defined to capture this important
characteristic that combines session orientation and applicable
session endpoint for translation.
An address map may consist of static or dynamic entries. NAT creates
static binds from a static address map entry. Each static bind has a
direct one-to-one relationship with a static address map entry. NAT
creates dynamic binds from a dynamic address map entry upon seeing
the first packet of a new session.
The following subsections define the key objects used in NAT MIB,
their inter-relationship, and how to configure a NAT device using the
MIB module.
4.1. natInterfaceTable
natInterfaceTable is defined in the MIB module to configure interface
specific realm type and the NAT services enabled for the interface.
natInterfaceTable is indexed by ifIndex and also includes interface
specific NAT statistics.
The first step for an operator in configuring a NAT device is
determining the interface over which NAT service is to be configured.
When NAT service is operational, translated packets traverse the NAT
device by ingressing on a private interface and egressing on a public
interface or vice versa. An operator may configure the NAT service
on either the public interface or the private interface in the
traversal path.
As the next step, the operator must identify the NAT service(s)
desired for the interface. The operator may configure one or more
NAT services on the same interface. The MIB module identifies four
types of NAT services: Basic NAT, NAPT, twice NAT and bidirectional
NAT. These are NAT varieties as defined in RFC 2663 [RFC2663]. Note
that RFC 3489 [RFC3489] further classifies NAPT implementations based
on the behavior exhibited by the NAPT devices from different vendors.
However, the MIB module does not explicitly distinguish between the
NAPT implementations. NAPT implementations may be distinguished
between one another by monitoring the BIND and NAT Session objects
generated by the NAT device as described in section 4.6.
4.2. natAddrMapTable
natAddrMapTable is defined in the MIB module to configure address
maps on a per-interface basis. natAddrMapTable is indexed by the
tuple of (ifIndex, natAddrMapIndex). The same table is also used to
collect Statistics for the address map entries. Address maps are key
to NAT configuration. An operator may configure one or more address
map entries per interface. NAT looks up address map entries in the
order in which they are defined to determine the translation function
at the start of each new session traversing the interface. An
address map may consist of static or dynamic entries. A static
address map entry has a direct one-to-one relationship with binds.
NAT will dynamically create binds from a dynamic address map entry.
The operator must be careful in selecting address map entries for an
interface based on the interface realm-type and the type of NAT
service desired. The operator can be amiss in the selection of
address map entries when not paying attention to the associated
interface characteristics defined in natInterfaceTable (described in
section 4.1). For example, say the operator wishes to configure a
NAPT map entry on an interface of a NAT device. If the operator
chooses to configure the NAPT map entry on a public interface (i.e.,
interface realm-type is public), the operator should set the
TranslationEntity of the NAPT address map entry to be
outboundSrcEndPoint. On the other hand, if the operator chooses to
configure the NAPT map entry on a private interface (i.e., interface
realm-type is private), the operator should set the TranslationEntity
of the NAPT address map entry to be InboundSrcEndPoint.
4.3. Default Timeouts, Protocol Table, and Other Scalars
DefTimeouts is defined in the MIB module to configure idle Bind
timeout and IP protocol specific idle NAT session timeouts. The
timeouts defined are global to the system and are not interface
specific.
Protocol specific statistics are maintained in natProtocolTable,
which is indexed by the protocol type.
The scalars natAddrBindNumberOfEntries and
natAddrPortBindNumberOfEntries hold the number of entries that
currently exist in the Address Bind and the Address Port Bind tables,
respectively.
The generation of natPacketDiscard notifications can be configured by
using the natNotifThrottlingInterval scalar MIB object.
4.4. natAddrBindTable and natAddrPortBindTable
Two Bind tables, natAddrBindTable and natAddrPortBindTable, are
defined to hold the bind entries. Entries are derived from the
address map table and are not configurable. natAddrBindTable
contains Address Binds, and natAddrPortBindTable contains Address
Port Binds. natAddrBindTable is indexed by the tuple of (ifIndex,
LocalAddrType, LocalAddr). natAddrPortBindTable is indexed by the
tuple of (ifIndex, LocalAddrType, LocalAddr, LocalPort, Protocol).
These tables also maintain bind specific statistics. A Symmetric NAT
will have no entries in the Bind tables.
4.5. natSessionTable
natSessionTable is defined to hold NAT session entries. NAT session
entries are derived from NAT Binds (except in the case of Symmetric
NAT) and are not configurable.
The NAT session provides the necessary translation glue between two
session representations of the same end-to-end session; that is, a
session as seen in the private realm and in the public realm.
Session orientation (inbound or outbound) is determined from the
orientation of the first packet traversing the NAT interface.
Address map entries and bind entries on the interface determine
whether a session is subject to NAT translation. One or both
endpoints of a session may be subject to translation.
With the exception of symmetric NAT, all other NAT functions use
end-point specific bind to perform individual end-point translations.
Multiple NAT sessions would use the same bind as long as they share
the same endpoint. Symmetric NAT does not retain a consistent port
bind across multiple sessions using the same endpoint. For this
reason, the bind identifier for a NAT session in symmetric NAT is set
to zero. natSessionTable is indexed by the tuple of (ifIndex,
natSessionIndex). Statistics for NAT sessions are also maintained in
the same table.
4.6. RFC 3489 NAPT Variations, NAT Session and Bind Tables
[RFC3489] defines four variations of NAPT - Full Cone, Restricted
Cone, Port Restricted Cone, and Symmetric NAT. These can be
differentiated in the NAT MIB based on different values for the
objects in the session and the bind tables, as indicated below.
In a Port Restricted Cone NAT, NAT Session objects will contain a
non-zero PrivateSrcEPBindId object. Further, all address and port
objects within a NAT session will have non-zero values (i.e., no
wildcard matches).
An Address Restricted Cone NAT may have been implemented in the same
way as a Port Restricted Cone NAT, except that the UDP NAT Sessions
may use ANY match on PrivateDstPort and PublicDstPort objects; i.e.,
PrivateDstPort and PublicDstPort objects within a NAT session may be
set to zero.
A Full Cone NAT may have also been implemented in the same way as a
Port Restricted Cone NAT, except that the UDP NAT Sessions may use
ANY match on PrivateDstAddr, PrivateDstPort, PublicDstAddr, and
PublicDstPort objects. Within a NAT Session, all four of these
objects may be set to zero. Alternately, all address and port
objects within a NAT Session may have non-zero values, yet the
TranslationEntity of the PrivateSrcEPBindId for the NAT Sessions may
be set bi-directionally, i.e., as a bit mask of (outboundSrcEndPoint
and inboundDstEndPoint) or (inboundSrcEndPoint and
outboundDstEndPoint), depending on the interface realm type. Lastly,
a Symmetric NAT does not maintain Port Bindings. As such, the NAT
Session objects will have the PrivateSrcEPBindId set to zero.
4.7. Notifications
natPacketDiscard notifies the end user/manager of packets being
discarded due to lack of address mappings.
4.8. Relation Among Tables
The association between the various NAT tables can be represented as
follows:
Interface
|
|
|
Address map
|
|
|
----------------------------------------------
| |
| |
| |
Address Bind Port Bind
| |
| |
| |
----------------------------------------------
|
|
|
NAT Session
All NAT functions, with the exception of Symmetric NAT, use Bind(s)
to provide the glue necessary for a NAT Session.
natSessionPrivateSrcEPBindId and natSessionPrivateDstEPBindId objects
represent the endpoint Binds used by NAT Sessions.
4.9. Configuration via the MIB
Sections 4.1 and 4.2 and part of section 4.3 refer to objects that
are configurable on a NAT device. NAT derives Address Bind and
Address Port Bind entries from the Address Map table. Hence, an
Address Bind or an Address Port Bind entry must not exist without an
associated entry in the Address Map table.
Further, NAT derives NAT session entries from NAT Binds, except in
the case of symmetric NAT, which derives translation parameters for a
NAT session directly from an address map entry. Hence, with the
exception of Symmetric NAT, a NAT session entry must not exist in the
NAT Session table without a corresponding bind.
A Management station may use the following steps to configure entries
in the NAT-MIB:
- Create an entry in the natInterfaceTable specifying the value of
ifIndex as the interface index of the interface on which NAT is
being configured. Specify appropriate values, as applicable, for
the other objects (e.g., natInterfaceRealm,
natInterfaceServiceType) in the table (refer to Section 4.1).
- Create one or more address map entries sequentially in reduced
order of priority in the natAddrMapTable, specifying the value of
ifIndex to be the same for all entries. The ifIndex specified
would be the same as that specified for natInterfaceTable (refer
to Section 4.2).
- Configure the maximum permitted idle time duration for BINDs and
TCP, UDP, and ICMP protocol sessions by setting the relevant
scalars in natDefTimeouts object (refer to Section 4.3).
4.10. Relationship to Interface MIB
The natInterfaceTable specifies the NAT configuration attributes on
each interface. The concept of "interface" is as defined by
InterfaceIndex/ifIndex of the IETF Interfaces MIB [RFC2863].
5. Definitions
This MIB module IMPORTs objects from RFCs 2578 [RFC2578], 2579
[RFC2579], 2580 [RFC2580], 2863 [RFC2863], 3411 [RFC3411], and 4001
[RFC4001]. It also refers to information in RFCs 792 [RFC792], 2463
[RFC2463], and 3413 [RFC3413].
NAT-MIB DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY,
OBJECT-TYPE,
Integer32,
Unsigned32,
Gauge32,
Counter64,
TimeTicks,
mib-2,
NOTIFICATION-TYPE
FROM SNMPv2-SMI
TEXTUAL-CONVENTION,
StorageType,
RowStatus
FROM SNMPv2-TC
MODULE-COMPLIANCE,
NOTIFICATION-GROUP,
OBJECT-GROUP
FROM SNMPv2-CONF
ifIndex,
ifCounterDiscontinuityGroup
FROM IF-MIB
SnmpAdminString
FROM SNMP-FRAMEWORK-MIB
InetAddressType,
InetAddress,
InetPortNumber
FROM INET-ADDRESS-MIB;
natMIB MODULE-IDENTITY
LAST-UPDATED "200503210000Z"
ORGANIZATION "IETF Transport Area"
CONTACT-INFO
"
Rohit
Mascon Global Limited
#59/2 100 ft Ring Road
Banashankari II Stage
Bangalore 560 070
India
Phone: +91 80 2679 6227
Email: rrohit74@hotmail.com
P. Srisuresh
Caymas Systems, Inc.
1179-A North McDowell Blvd.
Petaluma, CA 94954
Tel: (707) 283-5063
Email: srisuresh@yahoo.com
Rajiv Raghunarayan
Cisco Systems Inc.
170 West Tasman Drive
San Jose, CA 95134
Phone: +1 408 853 9612
Email: raraghun@cisco.com
Nalinaksh Pai
Cisco Systems, Inc.
Prestige Waterford
No. 9, Brunton Road
Bangalore - 560 025
India
Phone: +91 80 532 1300
Email: npai@cisco.com
Cliff Wang
Information Security
Bank One Corp
1111 Polaris Pkwy
Columbus, OH 43240
Phone: +1 614 213 6117
Email: cliffwang2000@yahoo.com
"
DESCRIPTION
"This MIB module defines the generic managed objects
for NAT.
Copyright (C) The Internet Society (2005). This version
of this MIB module is part of RFC 4008; see the RFC
itself for full legal notices."
REVISION "200503210000Z" -- 21th March 2005
DESCRIPTION
"Initial version, published as RFC 4008."
::= { mib-2 123 }
natMIBObjects OBJECT IDENTIFIER ::= { natMIB 1 }
NatProtocolType ::= TEXTUAL-CONVENTION
STATUS current
DESCRIPTION
"A list of protocols that support the network
address translation. Inclusion of the values is
not intended to imply that those protocols
need to be supported. Any change in this
TEXTUAL-CONVENTION should also be reflected in
the definition of NatProtocolMap, which is a
BITS representation of this."
SYNTAX INTEGER {
none (1), -- not specified
other (2), -- none of the following
icmp (3),
udp (4),
tcp (5)
}
NatProtocolMap ::= TEXTUAL-CONVENTION
STATUS current
DESCRIPTION
"A bitmap of protocol identifiers that support
the network address translation. Any change
in this TEXTUAL-CONVENTION should also be
reflected in the definition of NatProtocolType."
SYNTAX BITS {
other (0),
icmp (1),
udp (2),
tcp (3)
}
NatAddrMapId ::= TEXTUAL-CONVENTION
DISPLAY-HINT "d"
STATUS current
DESCRIPTION
"A unique id that is assigned to each address map
by a NAT enabled device."
SYNTAX Unsigned32 (1..4294967295)
NatBindIdOrZero ::= TEXTUAL-CONVENTION
DISPLAY-HINT "d"
STATUS current
DESCRIPTION
"A unique id that is assigned to each bind by
a NAT enabled device. The bind id will be zero
in the case of a Symmetric NAT."
SYNTAX Unsigned32 (0..4294967295)
NatBindId ::= TEXTUAL-CONVENTION
DISPLAY-HINT "d"
STATUS current
DESCRIPTION
"A unique id that is assigned to each bind by
a NAT enabled device."
SYNTAX Unsigned32 (1..4294967295)
NatSessionId ::= TEXTUAL-CONVENTION
DISPLAY-HINT "d"
STATUS current
DESCRIPTION
"A unique id that is assigned to each session by
a NAT enabled device."
SYNTAX Unsigned32 (1..4294967295)
NatBindMode ::= TEXTUAL-CONVENTION
STATUS current
DESCRIPTION
"An indication of whether the bind is
an address bind or an address port bind."
SYNTAX INTEGER {
addressBind (1),
addressPortBind (2)
}
NatAssociationType ::= TEXTUAL-CONVENTION
STATUS current
DESCRIPTION
"An indication of whether the association is
static or dynamic."
SYNTAX INTEGER {
static (1),
dynamic (2)
}
NatTranslationEntity ::= TEXTUAL-CONVENTION
STATUS current
DESCRIPTION
"An indication of a) the direction of a session for
which an address map entry, address bind or port
bind is applicable, and b) the entity (source or
destination) within the session that is subject to
translation."
SYNTAX BITS {
inboundSrcEndPoint (0),
outboundDstEndPoint(1),
inboundDstEndPoint (2),
outboundSrcEndPoint(3)
}
--
-- Default Values for the Bind and NAT Protocol Timers
--
natDefTimeouts OBJECT IDENTIFIER ::= { natMIBObjects 1 }
natNotifCtrl OBJECT IDENTIFIER ::= { natMIBObjects 2 }
--
-- Address Bind and Port Bind related NAT configuration
--
natBindDefIdleTimeout OBJECT-TYPE
SYNTAX Unsigned32 (0..4294967295)
UNITS "seconds"
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"The default Bind (Address Bind or Port Bind) idle
timeout parameter.
If the agent is capable of storing non-volatile
configuration, then the value of this object must be
restored after a re-initialization of the management
system."
DEFVAL { 0 }
::= { natDefTimeouts 1 }
--
-- UDP related NAT configuration
--
natUdpDefIdleTimeout OBJECT-TYPE
SYNTAX Unsigned32 (1..4294967295)
UNITS "seconds"
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"The default UDP idle timeout parameter.
If the agent is capable of storing non-volatile
configuration, then the value of this object must be
restored after a re-initialization of the management
system."
DEFVAL { 300 }
::= { natDefTimeouts 2 }
--
-- ICMP related NAT configuration
--
natIcmpDefIdleTimeout OBJECT-TYPE
SYNTAX Unsigned32 (1..4294967295)
UNITS "seconds"
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"The default ICMP idle timeout parameter.
If the agent is capable of storing non-volatile
configuration, then the value of this object must be
restored after a re-initialization of the management
system."
DEFVAL { 300 }
::= { natDefTimeouts 3 }
--
-- Other protocol parameters
--
natOtherDefIdleTimeout OBJECT-TYPE
SYNTAX Unsigned32 (1..4294967295)
UNITS "seconds"
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"The default idle timeout parameter for protocols
represented by the value other (2) in
NatProtocolType.
If the agent is capable of storing non-volatile
configuration, then the value of this object must be
restored after a re-initialization of the management
system."
DEFVAL { 60 }
::= { natDefTimeouts 4 }
--
-- TCP related NAT Timers
--
natTcpDefIdleTimeout OBJECT-TYPE
SYNTAX Unsigned32 (1..4294967295)
UNITS "seconds"
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"The default time interval that a NAT session for an
established TCP connection is allowed to remain
valid without any activity on the TCP connection.
If the agent is capable of storing non-volatile
configuration, then the value of this object must be
restored after a re-initialization of the management
system."
DEFVAL { 86400 }
::= { natDefTimeouts 5 }
natTcpDefNegTimeout OBJECT-TYPE
SYNTAX Unsigned32 (1..4294967295)
UNITS "seconds"
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"The default time interval that a NAT session for a TCP
connection that is not in the established state
is allowed to remain valid without any activity on
the TCP connection.
If the agent is capable of storing non-volatile
configuration, then the value of this object must be
restored after a re-initialization of the management
system."
DEFVAL { 60 }
::= { natDefTimeouts 6 }
natNotifThrottlingInterval OBJECT-TYPE
SYNTAX Integer32 (0 | 5..3600)
UNITS "seconds"
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This object controls the generation of the
natPacketDiscard notification.
If this object has a value of zero, then no
natPacketDiscard notifications will be transmitted by the
agent.
If this object has a non-zero value, then the agent must
not generate more than one natPacketDiscard
'notification-event' in the indicated period, where a
'notification-event' is the generation of a single
notification PDU type to a list of notification
destinations. If additional NAT packets are discarded
within the throttling period, then notification-events
for these changes must be suppressed by the agent until
the current throttling period expires.
If natNotifThrottlingInterval notification generation
is enabled, the suggested default throttling period is
60 seconds, but generation of the natPacketDiscard
notification should be disabled by default.
If the agent is capable of storing non-volatile
configuration, then the value of this object must be
restored after a re-initialization of the management
system.
The actual transmission of notifications is controlled
via the MIB modules in RFC 3413."
DEFVAL { 0 }
::= { natNotifCtrl 1 }
--
-- The NAT Interface Table
--
natInterfaceTable OBJECT-TYPE
SYNTAX SEQUENCE OF NatInterfaceEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table specifies the attributes for interfaces on a
device supporting NAT function."
::= { natMIBObjects 3 }
natInterfaceEntry OBJECT-TYPE
SYNTAX NatInterfaceEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Each entry in the natInterfaceTable holds a set of
parameters for an interface, instantiated by
ifIndex. Therefore, the interface index must have been
assigned, according to the applicable procedures,
before it can be meaningfully used.
Generally, this means that the interface must exist.
When natStorageType is of type nonVolatile, however,
this may reflect the configuration for an interface whose
ifIndex has been assigned but for which the supporting
implementation is not currently present."
INDEX { ifIndex }
::= { natInterfaceTable 1 }
NatInterfaceEntry ::= SEQUENCE {
natInterfaceRealm INTEGER,
natInterfaceServiceType BITS,
natInterfaceInTranslates Counter64,
natInterfaceOutTranslates Counter64,
natInterfaceDiscards Counter64,
natInterfaceStorageType StorageType,
natInterfaceRowStatus RowStatus
}
natInterfaceRealm OBJECT-TYPE
SYNTAX INTEGER {
private (1),
public (2)
}
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This object identifies whether this interface is
connected to the private or the public realm."
DEFVAL { public }
::= { natInterfaceEntry 1 }
natInterfaceServiceType OBJECT-TYPE
SYNTAX BITS {
basicNat (0),
napt (1),
bidirectionalNat (2),
twiceNat (3)
}
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"An indication of the direction in which new sessions
are permitted and the extent of translation done within
the IP and transport headers."
::= { natInterfaceEntry 2 }
natInterfaceInTranslates OBJECT-TYPE
SYNTAX Counter64
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of packets received on this interface that
were translated.
Discontinuities in the value of this counter can occur at
reinitialization of the management system and at other
times as indicated by the value of
ifCounterDiscontinuityTime on the relevant interface."
::= { natInterfaceEntry 3 }
natInterfaceOutTranslates OBJECT-TYPE
SYNTAX Counter64
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of translated packets that were sent out this
interface.
Discontinuities in the value of this counter can occur at
reinitialization of the management system and at other
times as indicated by the value of
ifCounterDiscontinuityTime on the relevant interface."
::= { natInterfaceEntry 4 }
natInterfaceDiscards OBJECT-TYPE
SYNTAX Counter64
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of packets that had to be rejected/dropped due to
a lack of resources for this interface.
Discontinuities in the value of this counter can occur at
reinitialization of the management system and at other
times as indicated by the value of
ifCounterDiscontinuityTime on the relevant interface."
::= { natInterfaceEntry 5 }
natInterfaceStorageType OBJECT-TYPE
SYNTAX StorageType
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The storage type for this conceptual row.
Conceptual rows having the value 'permanent'
need not allow write-access to any columnar objects
in the row."
REFERENCE
"Textual Conventions for SMIv2, Section 2."
DEFVAL { nonVolatile }
::= { natInterfaceEntry 6 }
natInterfaceRowStatus OBJECT-TYPE
SYNTAX RowStatus
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The status of this conceptual row.
Until instances of all corresponding columns are
appropriately configured, the value of the
corresponding instance of the natInterfaceRowStatus
column is 'notReady'.
In particular, a newly created row cannot be made
active until the corresponding instance of
natInterfaceServiceType has been set.
None of the objects in this row may be modified
while the value of this object is active(1)."
REFERENCE
"Textual Conventions for SMIv2, Section 2."
::= { natInterfaceEntry 7 }
--
-- The Address Map Table
--
natAddrMapTable OBJECT-TYPE
SYNTAX SEQUENCE OF NatAddrMapEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table lists address map parameters for NAT."
::= { natMIBObjects 4 }
natAddrMapEntry OBJECT-TYPE
SYNTAX NatAddrMapEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This entry represents an address map to be used for
NAT and contributes to the dynamic and/or static
address mapping tables of the NAT device."
INDEX { ifIndex, natAddrMapIndex }
::= { natAddrMapTable 1 }
NatAddrMapEntry ::= SEQUENCE {
natAddrMapIndex NatAddrMapId,
natAddrMapName SnmpAdminString,
natAddrMapEntryType NatAssociationType,
natAddrMapTranslationEntity NatTranslationEntity,
natAddrMapLocalAddrType InetAddressType,
natAddrMapLocalAddrFrom InetAddress,
natAddrMapLocalAddrTo InetAddress,
natAddrMapLocalPortFrom InetPortNumber,
natAddrMapLocalPortTo InetPortNumber,
natAddrMapGlobalAddrType InetAddressType,
natAddrMapGlobalAddrFrom InetAddress,
natAddrMapGlobalAddrTo InetAddress,
natAddrMapGlobalPortFrom InetPortNumber,
natAddrMapGlobalPortTo InetPortNumber,
natAddrMapProtocol NatProtocolMap,
natAddrMapInTranslates Counter64,
natAddrMapOutTranslates Counter64,
natAddrMapDiscards Counter64,
natAddrMapAddrUsed Gauge32,
natAddrMapStorageType StorageType,
natAddrMapRowStatus RowStatus
}
natAddrMapIndex OBJECT-TYPE
SYNTAX NatAddrMapId
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Along with ifIndex, this object uniquely
identifies an entry in the natAddrMapTable.
Address map entries are applied in the order
specified by natAddrMapIndex."
::= { natAddrMapEntry 1 }
natAddrMapName OBJECT-TYPE
SYNTAX SnmpAdminString (SIZE(1..32))
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"Name identifying all map entries in the table associated
with the same interface. All map entries with the same
ifIndex MUST have the same map name."
::= { natAddrMapEntry 2 }
natAddrMapEntryType OBJECT-TYPE
SYNTAX NatAssociationType
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This parameter can be used to set up static
or dynamic address maps."
::= { natAddrMapEntry 3 }
natAddrMapTranslationEntity OBJECT-TYPE
SYNTAX NatTranslationEntity
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The end-point entity (source or destination) in
inbound or outbound sessions (i.e., first packets) that
may be translated by an address map entry.
Session direction (inbound or outbound) is
derived from the direction of the first packet
of a session traversing a NAT interface.
NAT address (and Transport-ID) maps may be defined
to effect inbound or outbound sessions.
Traditionally, address maps for Basic NAT and NAPT are
configured on a public interface for outbound sessions,
effecting translation of source end-point. The value of
this object must be set to outboundSrcEndPoint for
those interfaces.
Alternately, if address maps for Basic NAT and NAPT were
to be configured on a private interface, the desired
value for this object for the map entries
would be inboundSrcEndPoint (i.e., effecting translation
of source end-point for inbound sessions).
If TwiceNAT were to be configured on a private interface,
the desired value for this object for the map entries
would be a bitmask of inboundSrcEndPoint and
inboundDstEndPoint."
::= { natAddrMapEntry 4 }
natAddrMapLocalAddrType OBJECT-TYPE
SYNTAX InetAddressType
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This object specifies the address type used for
natAddrMapLocalAddrFrom and natAddrMapLocalAddrTo."
::= { natAddrMapEntry 5 }
natAddrMapLocalAddrFrom OBJECT-TYPE
SYNTAX InetAddress
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This object specifies the first IP address of the range
of IP addresses mapped by this translation entry. The
value of this object must be less than or equal to the
value of the natAddrMapLocalAddrTo object.
The type of this address is determined by the value of
the natAddrMapLocalAddrType object."
::= { natAddrMapEntry 6 }
natAddrMapLocalAddrTo OBJECT-TYPE
SYNTAX InetAddress
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This object specifies the last IP address of the range of
IP addresses mapped by this translation entry. If only
a single address is being mapped, the value of this object
is equal to the value of natAddrMapLocalAddrFrom. For a
static NAT, the number of addresses in the range defined
by natAddrMapLocalAddrFrom and natAddrMapLocalAddrTo must
be equal to the number of addresses in the range defined by
natAddrMapGlobalAddrFrom and natAddrMapGlobalAddrTo.
The value of this object must be greater than or equal to
the value of the natAddrMapLocalAddrFrom object.
The type of this address is determined by the value of
the natAddrMapLocalAddrType object."
::= { natAddrMapEntry 7 }
natAddrMapLocalPortFrom OBJECT-TYPE
SYNTAX InetPortNumber
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"If this conceptual row describes a Basic NAT address
mapping, then the value of this object must be zero. If
this conceptual row describes NAPT, then the value of
this object specifies the first port number in the range
of ports being mapped.
The value of this object must be less than or equal to the
value of the natAddrMapLocalPortTo object. If the
translation specifies a single port, then the value of this
object is equal to the value of natAddrMapLocalPortTo."
DEFVAL { 0 }
::= { natAddrMapEntry 8 }
natAddrMapLocalPortTo OBJECT-TYPE
SYNTAX InetPortNumber
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"If this conceptual row describes a Basic NAT address
mapping, then the value of this object must be zero. If
this conceptual row describes NAPT, then the value of
this object specifies the last port number in the range
of ports being mapped.
The value of this object must be greater than or equal to
the value of the natAddrMapLocalPortFrom object. If the
translation specifies a single port, then the value of this
object is equal to the value of natAddrMapLocalPortFrom."
DEFVAL { 0 }
::= { natAddrMapEntry 9 }
natAddrMapGlobalAddrType OBJECT-TYPE
SYNTAX InetAddressType
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This object specifies the address type used for
natAddrMapGlobalAddrFrom and natAddrMapGlobalAddrTo."
::= { natAddrMapEntry 10 }
natAddrMapGlobalAddrFrom OBJECT-TYPE
SYNTAX InetAddress
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This object specifies the first IP address of the range of
IP addresses being mapped to. The value of this object
must be less than or equal to the value of the
natAddrMapGlobalAddrTo object.
The type of this address is determined by the value of
the natAddrMapGlobalAddrType object."
::= { natAddrMapEntry 11 }
natAddrMapGlobalAddrTo OBJECT-TYPE
SYNTAX InetAddress
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This object specifies the last IP address of the range of
IP addresses being mapped to. If only a single address is
being mapped to, the value of this object is equal to the
value of natAddrMapGlobalAddrFrom. For a static NAT, the
number of addresses in the range defined by
natAddrMapGlobalAddrFrom and natAddrMapGlobalAddrTo must be
equal to the number of addresses in the range defined by
natAddrMapLocalAddrFrom and natAddrMapLocalAddrTo.
The value of this object must be greater than or equal to
the value of the natAddrMapGlobalAddrFrom object.
The type of this address is determined by the value of
the natAddrMapGlobalAddrType object."
::= { natAddrMapEntry 12 }
natAddrMapGlobalPortFrom OBJECT-TYPE
SYNTAX InetPortNumber
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"If this conceptual row describes a Basic NAT address
mapping, then the value of this object must be zero. If
this conceptual row describes NAPT, then the value of
this object specifies the first port number in the range
of ports being mapped to.
The value of this object must be less than or equal to the
value of the natAddrMapGlobalPortTo object. If the
translation specifies a single port, then the value of this
object is equal to the value natAddrMapGlobalPortTo."
DEFVAL { 0 }
::= { natAddrMapEntry 13 }
natAddrMapGlobalPortTo OBJECT-TYPE
SYNTAX InetPortNumber
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"If this conceptual row describes a Basic NAT address
mapping, then the value of this object must be zero. If
this conceptual row describes NAPT, then the value of this
object specifies the last port number in the range of
ports being mapped to.
The value of this object must be greater than or equal to
the value of the natAddrMapGlobalPortFrom object. If the
translation specifies a single port, then the value of this
object is equal to the value of natAddrMapGlobalPortFrom."
DEFVAL { 0 }
::= { natAddrMapEntry 14 }
natAddrMapProtocol OBJECT-TYPE
SYNTAX NatProtocolMap
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This object specifies a bitmap of protocol identifiers."
::= { natAddrMapEntry 15 }
natAddrMapInTranslates OBJECT-TYPE
SYNTAX Counter64
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of inbound packets pertaining to this address
map entry that were translated.
Discontinuities in the value of this counter can occur at
reinitialization of the management system and at other
times, as indicated by the value of
ifCounterDiscontinuityTime on the relevant interface."
::= { natAddrMapEntry 16 }
natAddrMapOutTranslates OBJECT-TYPE
SYNTAX Counter64
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of outbound packets pertaining to this
address map entry that were translated.
Discontinuities in the value of this counter can occur at
reinitialization of the management system and at other
times, as indicated by the value of
ifCounterDiscontinuityTime on the relevant interface."
::= { natAddrMapEntry 17 }
natAddrMapDiscards OBJECT-TYPE
SYNTAX Counter64
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of packets pertaining to this address map
entry that were dropped due to lack of addresses in the
address pool identified by this address map. The value of
this object must always be zero in case of static
address map.
Discontinuities in the value of this counter can occur at
reinitialization of the management system and at other
times, as indicated by the value of
ifCounterDiscontinuityTime on the relevant interface."
::= { natAddrMapEntry 18 }
natAddrMapAddrUsed OBJECT-TYPE
SYNTAX Gauge32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of addresses pertaining to this address map
that are currently being used from the NAT pool.
The value of this object must always be zero in the case
of a static address map."
::= { natAddrMapEntry 19 }
natAddrMapStorageType OBJECT-TYPE
SYNTAX StorageType
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The storage type for this conceptual row.
Conceptual rows having the value 'permanent'
need not allow write-access to any columnar objects
in the row."
REFERENCE
"Textual Conventions for SMIv2, Section 2."
DEFVAL { nonVolatile }
::= { natAddrMapEntry 20 }
natAddrMapRowStatus OBJECT-TYPE
SYNTAX RowStatus
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The status of this conceptual row.
Until instances of all corresponding columns are
appropriately configured, the value of the
corresponding instance of the natAddrMapRowStatus
column is 'notReady'.
None of the objects in this row may be modified
while the value of this object is active(1)."
REFERENCE
"Textual Conventions for SMIv2, Section 2."
::= { natAddrMapEntry 21 }
--
-- Address Bind section
--
natAddrBindNumberOfEntries OBJECT-TYPE
SYNTAX Gauge32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object maintains a count of the number of entries
that currently exist in the natAddrBindTable."
::= { natMIBObjects 5 }
--
-- The NAT Address BIND Table
--
natAddrBindTable OBJECT-TYPE
SYNTAX SEQUENCE OF NatAddrBindEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table holds information about the currently
active NAT BINDs."
::= { natMIBObjects 6 }
natAddrBindEntry OBJECT-TYPE
SYNTAX NatAddrBindEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Each entry in this table holds information about
an active address BIND. These entries are lost
upon agent restart.
This row has indexing which may create variables with
more than 128 subidentifiers. Implementers of this table
must be careful not to create entries that would result
in OIDs which exceed the 128 subidentifier limit.
Otherwise, the information cannot be accessed using
SNMPv1, SNMPv2c or SNMPv3."
INDEX { ifIndex, natAddrBindLocalAddrType, natAddrBindLocalAddr }
::= { natAddrBindTable 1 }
NatAddrBindEntry ::= SEQUENCE {
natAddrBindLocalAddrType InetAddressType,
natAddrBindLocalAddr InetAddress,
natAddrBindGlobalAddrType InetAddressType,
natAddrBindGlobalAddr InetAddress,
natAddrBindId NatBindId,
natAddrBindTranslationEntity NatTranslationEntity,
natAddrBindType NatAssociationType,
natAddrBindMapIndex NatAddrMapId,
natAddrBindSessions Gauge32,
natAddrBindMaxIdleTime TimeTicks,
natAddrBindCurrentIdleTime TimeTicks,
natAddrBindInTranslates Counter64,
natAddrBindOutTranslates Counter64
}
natAddrBindLocalAddrType OBJECT-TYPE
SYNTAX InetAddressType
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This object specifies the address type used for
natAddrBindLocalAddr."
::= { natAddrBindEntry 1 }
natAddrBindLocalAddr OBJECT-TYPE
SYNTAX InetAddress
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This object represents the private-realm specific network
layer address, which maps to the public-realm address
represented by natAddrBindGlobalAddr.
The type of this address is determined by the value of
the natAddrBindLocalAddrType object."
::= { natAddrBindEntry 2 }
natAddrBindGlobalAddrType OBJECT-TYPE
SYNTAX InetAddressType
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object specifies the address type used for
natAddrBindGlobalAddr."
::= { natAddrBindEntry 3 }
natAddrBindGlobalAddr OBJECT-TYPE
SYNTAX InetAddress
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object represents the public-realm network layer
address that maps to the private-realm network layer
address represented by natAddrBindLocalAddr.
The type of this address is determined by the value of
the natAddrBindGlobalAddrType object."
::= { natAddrBindEntry 4 }
natAddrBindId OBJECT-TYPE
SYNTAX NatBindId
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object represents a bind id that is dynamically
assigned to each bind by a NAT enabled device. Each
bind is represented by a bind id that is
unique across both, the natAddrBindTable and the
natAddrPortBindTable."
::= { natAddrBindEntry 5 }
natAddrBindTranslationEntity OBJECT-TYPE
SYNTAX NatTranslationEntity
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object represents the direction of sessions
for which this bind is applicable and the endpoint entity
(source or destination) within the sessions that is
subject to translation using the BIND.
Orientation of the bind can be a superset of
translationEntity of the address map entry which
forms the basis for this bind.
For example, if the translationEntity of an
address map entry is outboundSrcEndPoint, the
translationEntity of a bind derived from this
map entry may either be outboundSrcEndPoint or
it may be bidirectional (a bitmask of
outboundSrcEndPoint and inboundDstEndPoint)."
::= { natAddrBindEntry 6 }
natAddrBindType OBJECT-TYPE
SYNTAX NatAssociationType
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object indicates whether the bind is static or
dynamic."
::= { natAddrBindEntry 7 }
natAddrBindMapIndex OBJECT-TYPE
SYNTAX NatAddrMapId
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object is a pointer to the natAddrMapTable entry
(and the parameters of that entry) which was used in
creating this BIND. This object, in conjunction with the
ifIndex (which identifies a unique addrMapName) points to
a unique entry in the natAddrMapTable."
::= { natAddrBindEntry 8 }
natAddrBindSessions OBJECT-TYPE
SYNTAX Gauge32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of sessions currently using this BIND."
::= { natAddrBindEntry 9 }
natAddrBindMaxIdleTime OBJECT-TYPE
SYNTAX TimeTicks
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object indicates the maximum time for
which this bind can be idle with no sessions
attached to it.
The value of this object is of relevance only for
dynamic NAT."
::= { natAddrBindEntry 10 }
natAddrBindCurrentIdleTime OBJECT-TYPE
SYNTAX TimeTicks
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"At any given instance, this object indicates the
time that this bind has been idle without any sessions
attached to it.
The value of this object is of relevance only for
dynamic NAT."
::= { natAddrBindEntry 11 }
natAddrBindInTranslates OBJECT-TYPE
SYNTAX Counter64
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of inbound packets that were successfully
translated by using this bind entry.
Discontinuities in the value of this counter can occur at
reinitialization of the management system and at other
times, as indicated by the value of
ifCounterDiscontinuityTime on the relevant interface."
::= { natAddrBindEntry 12 }
natAddrBindOutTranslates OBJECT-TYPE
SYNTAX Counter64
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of outbound packets that were successfully
translated using this bind entry.
Discontinuities in the value of this counter can occur at
reinitialization of the management system and at other
times as indicated by the value of
ifCounterDiscontinuityTime on the relevant interface."
::= { natAddrBindEntry 13 }
--
-- Address Port Bind section
--
natAddrPortBindNumberOfEntries OBJECT-TYPE
SYNTAX Gauge32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object maintains a count of the number of entries
that currently exist in the natAddrPortBindTable."
::= { natMIBObjects 7 }
--
-- The NAT Address Port Bind Table
--
natAddrPortBindTable OBJECT-TYPE
SYNTAX SEQUENCE OF NatAddrPortBindEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table holds information about the currently
active NAPT BINDs."
::= { natMIBObjects 8 }
natAddrPortBindEntry OBJECT-TYPE
SYNTAX NatAddrPortBindEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Each entry in the this table holds information
about a NAPT bind that is currently active.
These entries are lost upon agent restart.
This row has indexing which may create variables with
more than 128 subidentifiers. Implementers of this table
must be careful not to create entries which would result
in OIDs that exceed the 128 subidentifier limit.
Otherwise, the information cannot be accessed using
SNMPv1, SNMPv2c or SNMPv3."
INDEX { ifIndex, natAddrPortBindLocalAddrType,
natAddrPortBindLocalAddr, natAddrPortBindLocalPort,
natAddrPortBindProtocol }
::= { natAddrPortBindTable 1 }
NatAddrPortBindEntry ::= SEQUENCE {
natAddrPortBindLocalAddrType InetAddressType,
natAddrPortBindLocalAddr InetAddress,
natAddrPortBindLocalPort InetPortNumber,
natAddrPortBindProtocol NatProtocolType,
natAddrPortBindGlobalAddrType InetAddressType,
natAddrPortBindGlobalAddr InetAddress,
natAddrPortBindGlobalPort InetPortNumber,
natAddrPortBindId NatBindId,
natAddrPortBindTranslationEntity NatTranslationEntity,
natAddrPortBindType NatAssociationType,
natAddrPortBindMapIndex NatAddrMapId,
natAddrPortBindSessions Gauge32,
natAddrPortBindMaxIdleTime TimeTicks,
natAddrPortBindCurrentIdleTime TimeTicks,
natAddrPortBindInTranslates Counter64,
natAddrPortBindOutTranslates Counter64
}
natAddrPortBindLocalAddrType OBJECT-TYPE
SYNTAX InetAddressType
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This object specifies the address type used for
natAddrPortBindLocalAddr."
::= { natAddrPortBindEntry 1 }
natAddrPortBindLocalAddr OBJECT-TYPE
SYNTAX InetAddress
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This object represents the private-realm specific network
layer address which, in conjunction with
natAddrPortBindLocalPort, maps to the public-realm
network layer address and transport id represented by
natAddrPortBindGlobalAddr and natAddrPortBindGlobalPort
respectively.
The type of this address is determined by the value of
the natAddrPortBindLocalAddrType object."
::= { natAddrPortBindEntry 2 }
natAddrPortBindLocalPort OBJECT-TYPE
SYNTAX InetPortNumber
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"For a protocol value TCP or UDP, this object represents
the private-realm specific port number. On the other
hand, for ICMP a bind is created only for query/response
type ICMP messages such as ICMP echo, Timestamp, and
Information request messages, and this object represents
the private-realm specific identifier in the ICMP
message, as defined in RFC 792 for ICMPv4 and in RFC
2463 for ICMPv6.
This object, together with natAddrPortBindProtocol,
natAddrPortBindLocalAddrType, and natAddrPortBindLocalAddr,
constitutes a session endpoint in the private realm. A
bind entry binds a private realm specific endpoint to a
public realm specific endpoint, as represented by the
tuple of (natAddrPortBindGlobalPort,
natAddrPortBindProtocol, natAddrPortBindGlobalAddrType,
and natAddrPortBindGlobalAddr)."
::= { natAddrPortBindEntry 3 }
natAddrPortBindProtocol OBJECT-TYPE
SYNTAX NatProtocolType
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This object specifies a protocol identifier. If the
value of this object is none(1), then this bind entry
applies to all IP traffic. Any other value of this object
specifies the class of IP traffic to which this BIND
applies."
::= { natAddrPortBindEntry 4 }
natAddrPortBindGlobalAddrType OBJECT-TYPE
SYNTAX InetAddressType
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object specifies the address type used for
natAddrPortBindGlobalAddr."
::= { natAddrPortBindEntry 5 }
natAddrPortBindGlobalAddr OBJECT-TYPE
SYNTAX InetAddress
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object represents the public-realm specific network
layer address that, in conjunction with
natAddrPortBindGlobalPort, maps to the private-realm
network layer address and transport id represented by
natAddrPortBindLocalAddr and natAddrPortBindLocalPort,
respectively.
The type of this address is determined by the value of
the natAddrPortBindGlobalAddrType object."
::= { natAddrPortBindEntry 6 }
natAddrPortBindGlobalPort OBJECT-TYPE
SYNTAX InetPortNumber
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"For a protocol value TCP or UDP, this object represents
the public-realm specific port number. On the other
hand, for ICMP a bind is created only for query/response
type ICMP messages such as ICMP echo, Timestamp, and
Information request messages, and this object represents
the public-realm specific identifier in the ICMP message,
as defined in RFC 792 for ICMPv4 and in RFC 2463 for
ICMPv6.
This object, together with natAddrPortBindProtocol,
natAddrPortBindGlobalAddrType, and
natAddrPortBindGlobalAddr, constitutes a session endpoint
in the public realm. A bind entry binds a public realm
specific endpoint to a private realm specific endpoint,
as represented by the tuple of
(natAddrPortBindLocalPort, natAddrPortBindProtocol,
natAddrPortBindLocalAddrType, and
natAddrPortBindLocalAddr)."
::= { natAddrPortBindEntry 7 }
natAddrPortBindId OBJECT-TYPE
SYNTAX NatBindId
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object represents a bind id that is dynamically
assigned to each bind by a NAT enabled device. Each
bind is represented by a unique bind id across both
the natAddrBindTable and the natAddrPortBindTable."
::= { natAddrPortBindEntry 8 }
natAddrPortBindTranslationEntity OBJECT-TYPE
SYNTAX NatTranslationEntity
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object represents the direction of sessions
for which this bind is applicable and the entity
(source or destination) within the sessions that is
subject to translation with the BIND.
Orientation of the bind can be a superset of the
translationEntity of the address map entry that
forms the basis for this bind.
For example, if the translationEntity of an
address map entry is outboundSrcEndPoint, the
translationEntity of a bind derived from this
map entry may either be outboundSrcEndPoint or
may be bidirectional (a bitmask of
outboundSrcEndPoint and inboundDstEndPoint)."
::= { natAddrPortBindEntry 9 }
natAddrPortBindType OBJECT-TYPE
SYNTAX NatAssociationType
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object indicates whether the bind is static or
dynamic."
::= { natAddrPortBindEntry 10 }
natAddrPortBindMapIndex OBJECT-TYPE
SYNTAX NatAddrMapId
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object is a pointer to the natAddrMapTable entry
(and the parameters of that entry) used in
creating this BIND. This object, in conjunction with the
ifIndex (which identifies a unique addrMapName), points
to a unique entry in the natAddrMapTable."
::= { natAddrPortBindEntry 11 }
natAddrPortBindSessions OBJECT-TYPE
SYNTAX Gauge32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of sessions currently using this BIND."
::= { natAddrPortBindEntry 12 }
natAddrPortBindMaxIdleTime OBJECT-TYPE
SYNTAX TimeTicks
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object indicates the maximum time for
which this bind can be idle without any sessions
attached to it.
The value of this object is of relevance
only for dynamic NAT."
::= { natAddrPortBindEntry 13 }
natAddrPortBindCurrentIdleTime OBJECT-TYPE
SYNTAX TimeTicks
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"At any given instance, this object indicates the
time that this bind has been idle without any sessions
attached to it.
The value of this object is of relevance
only for dynamic NAT."
::= { natAddrPortBindEntry 14 }
natAddrPortBindInTranslates OBJECT-TYPE
SYNTAX Counter64
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of inbound packets that were translated as per
this bind entry.
Discontinuities in the value of this counter can occur at
reinitialization of the management system and at other
times, as indicated by the value of
ifCounterDiscontinuityTime on the relevant interface."
::= { natAddrPortBindEntry 15 }
natAddrPortBindOutTranslates OBJECT-TYPE
SYNTAX Counter64
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of outbound packets that were translated as per
this bind entry.
Discontinuities in the value of this counter can occur at
reinitialization of the management system and at other
times, as indicated by the value of
ifCounterDiscontinuityTime on the relevant interface."
::= { natAddrPortBindEntry 16 }
--
-- The Session Table
--
natSessionTable OBJECT-TYPE
SYNTAX SEQUENCE OF NatSessionEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The (conceptual) table containing one entry for each
NAT session currently active on this NAT device."
::= { natMIBObjects 9 }
natSessionEntry OBJECT-TYPE
SYNTAX NatSessionEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry (conceptual row) containing information
about an active NAT session on this NAT device.
These entries are lost upon agent restart."
INDEX { ifIndex, natSessionIndex }
::= { natSessionTable 1 }
NatSessionEntry ::= SEQUENCE {
natSessionIndex NatSessionId,
natSessionPrivateSrcEPBindId NatBindIdOrZero,
natSessionPrivateSrcEPBindMode NatBindMode,
natSessionPrivateDstEPBindId NatBindIdOrZero,
natSessionPrivateDstEPBindMode NatBindMode,
natSessionDirection INTEGER,
natSessionUpTime TimeTicks,
natSessionAddrMapIndex NatAddrMapId,
natSessionProtocolType NatProtocolType,
natSessionPrivateAddrType InetAddressType,
natSessionPrivateSrcAddr InetAddress,
natSessionPrivateSrcPort InetPortNumber,
natSessionPrivateDstAddr InetAddress,
natSessionPrivateDstPort InetPortNumber,
natSessionPublicAddrType InetAddressType,
natSessionPublicSrcAddr InetAddress,
natSessionPublicSrcPort InetPortNumber,
natSessionPublicDstAddr InetAddress,
natSessionPublicDstPort InetPortNumber,
natSessionMaxIdleTime TimeTicks,
natSessionCurrentIdleTime TimeTicks,
natSessionInTranslates Counter64,
natSessionOutTranslates Counter64
}
natSessionIndex OBJECT-TYPE
SYNTAX NatSessionId
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The session ID for this NAT session."
::= { natSessionEntry 1 }
natSessionPrivateSrcEPBindId OBJECT-TYPE
SYNTAX NatBindIdOrZero
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The bind id associated between private and public
source end points. In the case of Symmetric-NAT,
this should be set to zero."
::= { natSessionEntry 2 }
natSessionPrivateSrcEPBindMode OBJECT-TYPE
SYNTAX NatBindMode
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object indicates whether the bind indicated
by the object natSessionPrivateSrcEPBindId
is an address bind or an address port bind."
::= { natSessionEntry 3 }
natSessionPrivateDstEPBindId OBJECT-TYPE
SYNTAX NatBindIdOrZero
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The bind id associated between private and public
destination end points."
::= { natSessionEntry 4 }
natSessionPrivateDstEPBindMode OBJECT-TYPE
SYNTAX NatBindMode
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object indicates whether the bind indicated
by the object natSessionPrivateDstEPBindId
is an address bind or an address port bind."
::= { natSessionEntry 5 }
natSessionDirection OBJECT-TYPE
SYNTAX INTEGER {
inbound (1),
outbound (2)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The direction of this session with respect to the
local network. 'inbound' indicates that this session
was initiated from the public network into the private
network. 'outbound' indicates that this session was
initiated from the private network into the public
network."
::= { natSessionEntry 6 }
natSessionUpTime OBJECT-TYPE
SYNTAX TimeTicks
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The up time of this session in one-hundredths of a
second."
::= { natSessionEntry 7 }
natSessionAddrMapIndex OBJECT-TYPE
SYNTAX NatAddrMapId
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object is a pointer to the natAddrMapTable entry
(and the parameters of that entry) used in
creating this session. This object, in conjunction with
the ifIndex (which identifies a unique addrMapName), points
to a unique entry in the natAddrMapTable."
::= { natSessionEntry 8 }
natSessionProtocolType OBJECT-TYPE
SYNTAX NatProtocolType
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The protocol type of this session."
::= { natSessionEntry 9 }
natSessionPrivateAddrType OBJECT-TYPE
SYNTAX InetAddressType
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object specifies the address type used for
natSessionPrivateSrcAddr and natSessionPrivateDstAddr."
::= { natSessionEntry 10 }
natSessionPrivateSrcAddr OBJECT-TYPE
SYNTAX InetAddress
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The source IP address of the session endpoint that
lies in the private network.
The value of this object must be zero only when the
natSessionPrivateSrcEPBindId object has a zero value.
When the value of this object is zero, the NAT session
lookup will match any IP address to this field.
The type of this address is determined by the value of
the natSessionPrivateAddrType object."
::= { natSessionEntry 11 }
natSessionPrivateSrcPort OBJECT-TYPE
SYNTAX InetPortNumber
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"When the value of protocol is TCP or UDP, this object
represents the source port in the first packet of session
while in private-realm. On the other hand, when the
protocol is ICMP, a NAT session is created only for
query/response type ICMP messages such as ICMP echo,
Timestamp, and Information request messages, and this
object represents the private-realm specific identifier
in the ICMP message, as defined in RFC 792 for ICMPv4
and in RFC 2463 for ICMPv6.
The value of this object must be zero when the
natSessionPrivateSrcEPBindId object has zero value
and value of natSessionPrivateSrcEPBindMode is
addressPortBind(2). In such a case, the NAT session
lookup will match any port number to this field.
The value of this object must be zero when the object
is not a representative field (SrcPort, DstPort, or
ICMP identifier) of the session tuple in either the
public realm or the private realm."
::= { natSessionEntry 12 }
natSessionPrivateDstAddr OBJECT-TYPE
SYNTAX InetAddress
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The destination IP address of the session endpoint that
lies in the private network.
The value of this object must be zero when the
natSessionPrivateDstEPBindId object has a zero value.
In such a scenario, the NAT session lookup will match
any IP address to this field.
The type of this address is determined by the value of
the natSessionPrivateAddrType object."
::= { natSessionEntry 13 }
natSessionPrivateDstPort OBJECT-TYPE
SYNTAX InetPortNumber
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"When the value of protocol is TCP or UDP, this object
represents the destination port in the first packet
of session while in private-realm. On the other hand,
when the protocol is ICMP, this object is not relevant
and should be set to zero.
The value of this object must be zero when the
natSessionPrivateDstEPBindId object has a zero
value and natSessionPrivateDstEPBindMode is set to
addressPortBind(2). In such a case, the NAT session
lookup will match any port number to this field.
The value of this object must be zero when the object
is not a representative field (SrcPort, DstPort, or
ICMP identifier) of the session tuple in either the
public realm or the private realm."
::= { natSessionEntry 14 }
natSessionPublicAddrType OBJECT-TYPE
SYNTAX InetAddressType
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object specifies the address type used for
natSessionPublicSrcAddr and natSessionPublicDstAddr."
::= { natSessionEntry 15 }
natSessionPublicSrcAddr OBJECT-TYPE
SYNTAX InetAddress
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The source IP address of the session endpoint that
lies in the public network.
The value of this object must be zero when the
natSessionPrivateSrcEPBindId object has a zero value.
In such a scenario, the NAT session lookup will match
any IP address to this field.
The type of this address is determined by the value of
the natSessionPublicAddrType object."
::= { natSessionEntry 16 }
natSessionPublicSrcPort OBJECT-TYPE
SYNTAX InetPortNumber
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"When the value of protocol is TCP or UDP, this object
represents the source port in the first packet of
session while in public-realm. On the other hand, when
protocol is ICMP, a NAT session is created only for
query/response type ICMP messages such as ICMP echo,
Timestamp, and Information request messages, and this
object represents the public-realm specific identifier
in the ICMP message, as defined in RFC 792 for ICMPv4
and in RFC 2463 for ICMPv6.
The value of this object must be zero when the
natSessionPrivateSrcEPBindId object has a zero value
and natSessionPrivateSrcEPBindMode is set to
addressPortBind(2). In such a scenario, the NAT
session lookup will match any port number to this
field.
The value of this object must be zero when the object
is not a representative field (SrcPort, DstPort or
ICMP identifier) of the session tuple in either the
public realm or the private realm."
::= { natSessionEntry 17 }
natSessionPublicDstAddr OBJECT-TYPE
SYNTAX InetAddress
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The destination IP address of the session endpoint that
lies in the public network.
The value of this object must be non-zero when the
natSessionPrivateDstEPBindId object has a non-zero
value. If the value of this object and the
corresponding natSessionPrivateDstEPBindId object value
is zero, then the NAT session lookup will match any IP
address to this field.
The type of this address is determined by the value of
the natSessionPublicAddrType object."
::= { natSessionEntry 18 }
natSessionPublicDstPort OBJECT-TYPE
SYNTAX InetPortNumber
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"When the value of protocol is TCP or UDP, this object
represents the destination port in the first packet of
session while in public-realm. On the other hand, when
the protocol is ICMP, this object is not relevant for
translation and should be zero.
The value of this object must be zero when the
natSessionPrivateDstEPBindId object has a zero value
and natSessionPrivateDstEPBindMode is
addressPortBind(2). In such a scenario, the NAT
session lookup will match any port number to this
field.
The value of this object must be zero when the object
is not a representative field (SrcPort, DstPort, or
ICMP identifier) of the session tuple in either the
public realm or the private realm."
::= { natSessionEntry 19 }
natSessionMaxIdleTime OBJECT-TYPE
SYNTAX TimeTicks
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The max time for which this session can be idle
without detecting a packet."
::= { natSessionEntry 20 }
natSessionCurrentIdleTime OBJECT-TYPE
SYNTAX TimeTicks
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The time since a packet belonging to this session was
last detected."
::= { natSessionEntry 21 }
natSessionInTranslates OBJECT-TYPE
SYNTAX Counter64
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of inbound packets that were translated for
this session.
Discontinuities in the value of this counter can occur at
reinitialization of the management system and at other
times, as indicated by the value of
ifCounterDiscontinuityTime on the relevant interface."
::= { natSessionEntry 22 }
natSessionOutTranslates OBJECT-TYPE
SYNTAX Counter64
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of outbound packets that were translated for
this session.
Discontinuities in the value of this counter can occur at
reinitialization of the management system and at other
times, as indicated by the value of
ifCounterDiscontinuityTime on the relevant interface."
::= { natSessionEntry 23 }
--
-- The Protocol table
--
natProtocolTable OBJECT-TYPE
SYNTAX SEQUENCE OF NatProtocolEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The (conceptual) table containing per protocol NAT
statistics."
::= { natMIBObjects 10 }
natProtocolEntry OBJECT-TYPE
SYNTAX NatProtocolEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry (conceptual row) containing NAT statistics
pertaining to a particular protocol."
INDEX { natProtocol }
::= { natProtocolTable 1 }
NatProtocolEntry ::= SEQUENCE {
natProtocol NatProtocolType,
natProtocolInTranslates Counter64,
natProtocolOutTranslates Counter64,
natProtocolDiscards Counter64
}
natProtocol OBJECT-TYPE
SYNTAX NatProtocolType
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This object represents the protocol pertaining to which
parameters are reported."
::= { natProtocolEntry 1 }
natProtocolInTranslates OBJECT-TYPE
SYNTAX Counter64
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of inbound packets pertaining to the protocol
identified by natProtocol that underwent NAT.
Discontinuities in the value of this counter can occur at
reinitialization of the management system and at other
times, as indicated by the value of
ifCounterDiscontinuityTime on the relevant interface."
::= { natProtocolEntry 2 }
natProtocolOutTranslates OBJECT-TYPE
SYNTAX Counter64
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of outbound packets pertaining to the protocol
identified by natProtocol that underwent NAT.
Discontinuities in the value of this counter can occur at
reinitialization of the management system and at other
times, as indicated by the value of
ifCounterDiscontinuityTime on the relevant interface."
::= { natProtocolEntry 3 }
natProtocolDiscards OBJECT-TYPE
SYNTAX Counter64
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of packets pertaining to the protocol
identified by natProtocol that had to be
rejected/dropped due to lack of resources. These
rejections could be due to session timeout, resource
unavailability, lack of address space, etc.
Discontinuities in the value of this counter can occur at
reinitialization of the management system and at other
times, as indicated by the value of
ifCounterDiscontinuityTime on the relevant interface."
::= { natProtocolEntry 4 }
--
-- Notifications section
--
natMIBNotifications OBJECT IDENTIFIER ::= { natMIB 0 }
--
-- Notifications
--
natPacketDiscard NOTIFICATION-TYPE
OBJECTS { ifIndex }
STATUS current
DESCRIPTION
"This notification is generated when IP packets are
discarded by the NAT function; e.g., due to lack of
mapping space when NAT is out of addresses or ports.
Note that the generation of natPacketDiscard
notifications is throttled by the agent, as specified
by the 'natNotifThrottlingInterval' object."
::= { natMIBNotifications 1 }
--
-- Conformance information.
--
natMIBConformance OBJECT IDENTIFIER ::= { natMIB 2 }
natMIBGroups OBJECT IDENTIFIER ::= { natMIBConformance 1 }
natMIBCompliances OBJECT IDENTIFIER ::= { natMIBConformance 2 }
--
-- Units of conformance
--
natConfigGroup OBJECT-GROUP
OBJECTS { natInterfaceRealm,
natInterfaceServiceType,
natInterfaceStorageType,
natInterfaceRowStatus,
natAddrMapName,
natAddrMapEntryType,
natAddrMapTranslationEntity,
natAddrMapLocalAddrType,
natAddrMapLocalAddrFrom,
natAddrMapLocalAddrTo,
natAddrMapLocalPortFrom,
natAddrMapLocalPortTo,
natAddrMapGlobalAddrType,
natAddrMapGlobalAddrFrom,
natAddrMapGlobalAddrTo,
natAddrMapGlobalPortFrom,
natAddrMapGlobalPortTo,
natAddrMapProtocol,
natAddrMapStorageType,
natAddrMapRowStatus,
natBindDefIdleTimeout,
natUdpDefIdleTimeout,
natIcmpDefIdleTimeout,
natOtherDefIdleTimeout,
natTcpDefIdleTimeout,
natTcpDefNegTimeout,
natNotifThrottlingInterval }
STATUS current
DESCRIPTION
"A collection of configuration-related information
required to support management of devices supporting
NAT."
::= { natMIBGroups 1 }
natTranslationGroup OBJECT-GROUP
OBJECTS { natAddrBindNumberOfEntries,
natAddrBindGlobalAddrType,
natAddrBindGlobalAddr,
natAddrBindId,
natAddrBindTranslationEntity,
natAddrBindType,
natAddrBindMapIndex,
natAddrBindSessions,
natAddrBindMaxIdleTime,
natAddrBindCurrentIdleTime,
natAddrBindInTranslates,
natAddrBindOutTranslates,
natAddrPortBindNumberOfEntries,
natAddrPortBindGlobalAddrType,
natAddrPortBindGlobalAddr,
natAddrPortBindGlobalPort,
natAddrPortBindId,
natAddrPortBindTranslationEntity,
natAddrPortBindType,
natAddrPortBindMapIndex,
natAddrPortBindSessions,
natAddrPortBindMaxIdleTime,
natAddrPortBindCurrentIdleTime,
natAddrPortBindInTranslates,
natAddrPortBindOutTranslates,
natSessionPrivateSrcEPBindId,
natSessionPrivateSrcEPBindMode,
natSessionPrivateDstEPBindId,
natSessionPrivateDstEPBindMode,
natSessionDirection,
natSessionUpTime,
natSessionAddrMapIndex,
natSessionProtocolType,
natSessionPrivateAddrType,
natSessionPrivateSrcAddr,
natSessionPrivateSrcPort,
natSessionPrivateDstAddr,
natSessionPrivateDstPort,
natSessionPublicAddrType,
natSessionPublicSrcAddr,
natSessionPublicSrcPort,
natSessionPublicDstAddr,
natSessionPublicDstPort,
natSessionMaxIdleTime,
natSessionCurrentIdleTime,
natSessionInTranslates,
natSessionOutTranslates }
STATUS current
DESCRIPTION
"A collection of BIND-related objects required to support
management of devices supporting NAT."
::= { natMIBGroups 2 }
natStatsInterfaceGroup OBJECT-GROUP
OBJECTS { natInterfaceInTranslates,
natInterfaceOutTranslates,
natInterfaceDiscards }
STATUS current
DESCRIPTION
"A collection of NAT statistics associated with the
interface on which NAT is configured, to aid
troubleshooting/monitoring of the NAT operation."
::= { natMIBGroups 3 }
natStatsProtocolGroup OBJECT-GROUP
OBJECTS { natProtocolInTranslates,
natProtocolOutTranslates,
natProtocolDiscards }
STATUS current
DESCRIPTION
"A collection of protocol specific NAT statistics,
to aid troubleshooting/monitoring of NAT operation."
::= { natMIBGroups 4 }
natStatsAddrMapGroup OBJECT-GROUP
OBJECTS { natAddrMapInTranslates,
natAddrMapOutTranslates,
natAddrMapDiscards,
natAddrMapAddrUsed }
STATUS current
DESCRIPTION
"A collection of address map specific NAT statistics,
to aid troubleshooting/monitoring of NAT operation."
::= { natMIBGroups 5 }
natMIBNotificationGroup NOTIFICATION-GROUP
NOTIFICATIONS { natPacketDiscard }
STATUS current
DESCRIPTION
"A collection of notifications generated by
devices supporting this MIB."
::= { natMIBGroups 6 }
--
-- Compliance statements
--
natMIBFullCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"When this MIB is implemented with support for
read-create, then such an implementation can claim
full compliance. Such devices can then be both
monitored and configured with this MIB.
The following index objects cannot be added as OBJECT
clauses but nevertheless have the compliance
requirements:
"
-- OBJECT natAddrBindLocalAddrType
-- SYNTAX InetAddressType { ipv4(1), ipv6(2) }
-- DESCRIPTION
-- "An implementation is required to support
-- global IPv4 and/or IPv6 addresses, depending
-- on its support for IPv4 and IPv6."
-- OBJECT natAddrBindLocalAddr
-- SYNTAX InetAddress (SIZE(4|16))
-- DESCRIPTION
-- "An implementation is required to support
-- global IPv4 and/or IPv6 addresses, depending
-- on its support for IPv4 and IPv6."
-- OBJECT natAddrPortBindLocalAddrType
-- SYNTAX InetAddressType { ipv4(1), ipv6(2) }
-- DESCRIPTION
-- "An implementation is required to support
-- global IPv4 and/or IPv6 addresses, depending
-- on its support for IPv4 and IPv6."
-- OBJECT natAddrPortBindLocalAddr
-- SYNTAX InetAddress (SIZE(4|16))
-- DESCRIPTION
-- "An implementation is required to support
-- global IPv4 and/or IPv6 addresses, depending
-- on its support for IPv4 and IPv6."
MODULE IF-MIB -- The interfaces MIB, RFC2863
MANDATORY-GROUPS {
ifCounterDiscontinuityGroup
}
MODULE -- this module
MANDATORY-GROUPS { natConfigGroup, natTranslationGroup,
natStatsInterfaceGroup }
GROUP natStatsProtocolGroup
DESCRIPTION
"This group is optional."
GROUP natStatsAddrMapGroup
DESCRIPTION
"This group is optional."
GROUP natMIBNotificationGroup
DESCRIPTION
"This group is optional."
OBJECT natAddrMapLocalAddrType
SYNTAX InetAddressType { ipv4(1), ipv6(2) }
DESCRIPTION
"An implementation is required to support global IPv4
and/or IPv6 addresses, depending on its support
for IPv4 and IPv6."
OBJECT natAddrMapLocalAddrFrom
SYNTAX InetAddress (SIZE(4|16))
DESCRIPTION
"An implementation is required to support global IPv4
and/or IPv6 addresses, depending on its support
for IPv4 and IPv6."
OBJECT natAddrMapLocalAddrTo
SYNTAX InetAddress (SIZE(4|16))
DESCRIPTION
"An implementation is required to support global IPv4
and/or IPv6 addresses, depending on its support
for IPv4 and IPv6."
OBJECT natAddrMapGlobalAddrType
SYNTAX InetAddressType { ipv4(1), ipv6(2) }
DESCRIPTION
"An implementation is required to support global IPv4
and/or IPv6 addresses, depending on its support
for IPv4 and IPv6."
OBJECT natAddrMapGlobalAddrFrom
SYNTAX InetAddress (SIZE(4|16))
DESCRIPTION
"An implementation is required to support global IPv4
and/or IPv6 addresses, depending on its support
for IPv4 and IPv6."
OBJECT natAddrMapGlobalAddrTo
SYNTAX InetAddress (SIZE(4|16))
DESCRIPTION
"An implementation is required to support global IPv4
and/or IPv6 addresses, depending on its support
for IPv4 and IPv6."
OBJECT natAddrBindGlobalAddrType
SYNTAX InetAddressType { ipv4(1), ipv6(2) }
DESCRIPTION
"An implementation is required to support global IPv4
and/or IPv6 addresses, depending on its support
for IPv4 and IPv6."
OBJECT natAddrBindGlobalAddr
SYNTAX InetAddress (SIZE(4|16))
DESCRIPTION
"An implementation is required to support global IPv4
and/or IPv6 addresses, depending on its support
for IPv4 and IPv6."
OBJECT natAddrPortBindGlobalAddrType
SYNTAX InetAddressType { ipv4(1), ipv6(2) }
DESCRIPTION
"An implementation is required to support global IPv4
and/or IPv6 addresses, depending on its support
for IPv4 and IPv6."
OBJECT natAddrPortBindGlobalAddr
SYNTAX InetAddress (SIZE(4|16))
DESCRIPTION
"An implementation is required to support global IPv4
and/or IPv6 addresses, depending on its support
for IPv4 and IPv6."
OBJECT natSessionPrivateAddrType
SYNTAX InetAddressType { ipv4(1), ipv6(2) }
DESCRIPTION
"An implementation is required to support global IPv4
and/or IPv6 addresses, depending on its support
for IPv4 and IPv6."
OBJECT natSessionPrivateSrcAddr
SYNTAX InetAddress (SIZE(4|16))
DESCRIPTION
"An implementation is required to support global IPv4
and/or IPv6 addresses, depending on its support
for IPv4 and IPv6."
OBJECT natSessionPrivateDstAddr
SYNTAX InetAddress (SIZE(4|16))
DESCRIPTION
"An implementation is required to support global IPv4
and/or IPv6 addresses, depending on its support
for IPv4 and IPv6."
OBJECT natSessionPublicAddrType
SYNTAX InetAddressType { ipv4(1), ipv6(2) }
DESCRIPTION
"An implementation is required to support global IPv4
and/or IPv6 addresses, depending on its support
for IPv4 and IPv6."
OBJECT natSessionPublicSrcAddr
SYNTAX InetAddress (SIZE(4|16))
DESCRIPTION
"An implementation is required to support global IPv4
and/or IPv6 addresses, depending on its support
for IPv4 and IPv6."
OBJECT natSessionPublicDstAddr
SYNTAX InetAddress (SIZE(4|16))
DESCRIPTION
"An implementation is required to support global IPv4
and/or IPv6 addresses, depending on its support
for IPv4 and IPv6."
::= { natMIBCompliances 1 }
natMIBReadOnlyCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"When this MIB is implemented without support for
read-create (i.e., in read-only mode), then such an
implementation can claim read-only compliance.
Such a device can then be monitored but cannot be
configured with this MIB.
The following index objects cannot be added as OBJECT
clauses but nevertheless have the compliance
requirements:
"
-- OBJECT natAddrBindLocalAddrType
-- SYNTAX InetAddressType { ipv4(1), ipv6(2) }
-- DESCRIPTION
-- "An implementation is required to support
-- global IPv4 and/or IPv6 addresses, depending
-- on its support for IPv4 and IPv6."
-- OBJECT natAddrBindLocalAddr
-- SYNTAX InetAddress (SIZE(4|16))
-- DESCRIPTION
-- "An implementation is required to support
-- global IPv4 and/or IPv6 addresses, depending
-- on its support for IPv4 and IPv6."
-- OBJECT natAddrPortBindLocalAddrType
-- SYNTAX InetAddressType { ipv4(1), ipv6(2) }
-- DESCRIPTION
-- "An implementation is required to support
-- global IPv4 and/or IPv6 addresses, depending
-- on its support for IPv4 and IPv6."
-- OBJECT natAddrPortBindLocalAddr
-- SYNTAX InetAddress (SIZE(4|16))
-- DESCRIPTION
-- "An implementation is required to support
-- global IPv4 and/or IPv6 addresses, depending
-- on its support for IPv4 and IPv6."
MODULE IF-MIB -- The interfaces MIB, RFC2863
MANDATORY-GROUPS {
ifCounterDiscontinuityGroup
}
MODULE -- this module
MANDATORY-GROUPS { natConfigGroup, natTranslationGroup,
natStatsInterfaceGroup }
GROUP natStatsProtocolGroup
DESCRIPTION
"This group is optional."
GROUP natStatsAddrMapGroup
DESCRIPTION
"This group is optional."
GROUP natMIBNotificationGroup
DESCRIPTION
"This group is optional."
OBJECT natInterfaceRowStatus
SYNTAX RowStatus { active(1) }
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required, and active is the only
status that needs to be supported."
OBJECT natAddrMapLocalAddrType
SYNTAX InetAddressType { ipv4(1), ipv6(2) }
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required. An implementation is
required to support global IPv4 and/or IPv6 addresses,
depending on its support for IPv4 and IPv6."
OBJECT natAddrMapLocalAddrFrom
SYNTAX InetAddress (SIZE(4|16))
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required. An implementation is
required to support global IPv4 and/or IPv6 addresses,
depending on its support for IPv4 and IPv6."
OBJECT natAddrMapLocalAddrTo
SYNTAX InetAddress (SIZE(4|16))
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required. An implementation is
required to support global IPv4 and/or IPv6 addresses,
depending on its support for IPv4 and IPv6."
OBJECT natAddrMapGlobalAddrType
SYNTAX InetAddressType { ipv4(1), ipv6(2) }
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required. An implementation is
required to support global IPv4 and/or IPv6 addresses,
depending on its support for IPv4 and IPv6."
OBJECT natAddrMapGlobalAddrFrom
SYNTAX InetAddress (SIZE(4|16))
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required. An implementation is
required to support global IPv4 and/or IPv6 addresses,
depending on its support for IPv4 and IPv6."
OBJECT natAddrMapGlobalAddrTo
SYNTAX InetAddress (SIZE(4|16))
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required. An implementation is
required to support global IPv4 and/or IPv6 addresses,
depending on its support for IPv4 and IPv6."
OBJECT natAddrMapRowStatus
SYNTAX RowStatus { active(1) }
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required, and active is the only
status that needs to be supported."
OBJECT natAddrBindGlobalAddrType
SYNTAX InetAddressType { ipv4(1), ipv6(2) }
DESCRIPTION
"An implementation is required to support global IPv4
and/or IPv6 addresses, depending on its support for
IPv4 and IPv6."
OBJECT natAddrBindGlobalAddr
SYNTAX InetAddress (SIZE(4|16))
DESCRIPTION
"An implementation is required to support global IPv4
and/or IPv6 addresses, depending on its support for
IPv4 and IPv6."
OBJECT natAddrPortBindGlobalAddrType
SYNTAX InetAddressType { ipv4(1), ipv6(2) }
DESCRIPTION
"An implementation is required to support global IPv4
and/or IPv6 addresses, depending on its support for
IPv4 and IPv6."
OBJECT natAddrPortBindGlobalAddr
SYNTAX InetAddress (SIZE(4|16))
DESCRIPTION
"An implementation is required to support global IPv4
and/or IPv6 addresses, depending on its support for
IPv4 and IPv6."
OBJECT natSessionPrivateAddrType
SYNTAX InetAddressType { ipv4(1), ipv6(2) }
DESCRIPTION
"An implementation is required to support global IPv4
and/or IPv6 addresses, depending on its support for
IPv4 and IPv6."
OBJECT natSessionPrivateSrcAddr
SYNTAX InetAddress (SIZE(4|16))
DESCRIPTION
"An implementation is required to support global IPv4
and/or IPv6 addresses, depending on its support for
IPv4 and IPv6."
OBJECT natSessionPrivateDstAddr
SYNTAX InetAddress (SIZE(4|16))
DESCRIPTION
"An implementation is required to support global IPv4
and/or IPv6 addresses, depending on its support for
IPv4 and IPv6."
OBJECT natSessionPublicAddrType
SYNTAX InetAddressType { ipv4(1), ipv6(2) }
DESCRIPTION
"An implementation is required to support global IPv4
and/or IPv6 addresses, depending on its support for
IPv4 and IPv6."
OBJECT natSessionPublicSrcAddr
SYNTAX InetAddress (SIZE(4|16))
DESCRIPTION
"An implementation is required to support global IPv4
and/or IPv6 addresses, depending on its support for
IPv4 and IPv6."
OBJECT natSessionPublicDstAddr
SYNTAX InetAddress (SIZE(4|16))
DESCRIPTION
"An implementation is required to support global IPv4
and/or IPv6 addresses, depending on its support for
IPv4 and IPv6."
::= { natMIBCompliances 2 }
END
6. Acknowledgements
The authors of the document would like to thank Randy Turner, Ashwini
S.T., Kevin Luehrs, Sam Sankoorikal, and Juergen Quittek for their
valuable feedback.
The authors would like to especially thank Juergen Schoenwaelder for
his patient and fine-combed review and detailed comments as a MIB
doctor. The NAT MIB is much clearer and flatter as a result of
Juergen's suggestions.
7. Security Considerations
It is clear that this MIB can potentially be useful for
configuration. Unauthorized access to the write-able objects could
cause a denial of service and/or widespread network disturbance.
Hence, the support for SET operations in a non-secure environment
without proper protection can have a negative effect on network
operations.
At this writing, no security holes have been identified beyond those
that SNMP Security is itself intended to address. These relate
primarily to controlled access to sensitive information and the
ability to configure a device - or which might result from operator
error, which is beyond the scope of any security architecture.
There are a number of managed objects in this MIB that may contain
information that may be sensitive from a business perspective, in
that they may represent NAT bind and session information. The NAT
bind and session objects reveal the identity of private hosts that
are engaged in a session with external end nodes. A curious outsider
could monitor these two objects to assess the number of private hosts
being supported by the NAT device. Further, a disgruntled former
employee of an enterprise could use the NAT bind and session
information to break into specific private hosts by intercepting the
existing sessions or originating new sessions into the host. There
are no objects that are sensitive in their own right, such as
passwords or monetary amounts. It may even be important to control
GET access to these objects and possibly to encrypt the values of
these objects when they are sent over the network via SNMP. Not all
versions of SNMP provide features for such a secure environment.
SNMP versions prior to SNMPv3 did not include adequate security.
Even if the network itself is secure (for example by using IPSec),
even then, there is no control as to who on the secure network is
allowed to access and GET/SET (read/change/create/delete) the objects
in this MIB.
It is recommended that the implementers consider the security
features as provided by the SNMPv3 framework (see [RFC3410], section
8), including full support for the SNMPv3 cryptographic mechanisms
(for authentication and privacy).
Further, deployment of SNMP versions prior to SNMPv3 is NOT
RECOMMENDED. Instead, it is RECOMMENDED to deploy SNMPv3 and to
enable cryptographic security. It is then a customer/operator
responsibility to ensure that the SNMP entity giving access to an
instance of this MIB module is properly configured to give access to
the objects only to those principals (users) that have legitimate
rights to indeed GET or SET (change/create/delete) them.
8. References
8.1. Normative References
[RFC2578] McCloghrie, K., Perkins, D., and J. Schoenwaelder,
"Structure of Management Information Version 2 (SMIv2)",
STD 58, RFC 2578, April 1999.
[RFC2579] McCloghrie, K., Perkins, D., and J. Schoenwaelder, "Textual
Conventions for SMIv2", STD 58, RFC 2579, April 1999.
[RFC2580] McCloghrie, K., Perkins, D., and J. Schoenwaelder,
"Conformance Statements for SMIv2", STD 58, RFC 2580, April
1999.
[RFC3022] Srisuresh, P. and K. Egevang, "Traditional IP Network
Address Translator (Traditional NAT)", RFC 3022, January
2001.
[RFC2663] Srisuresh, P. and M. Holdrege, "IP Network Address
Translator (NAT) Terminology and Considerations", RFC 2663,
August 1999.
[RFC4001] Daniele, M., Haberman, B., Routhier, S., Schoenwaelder, J.,
"Textual Conventions for Internet Network Addresses", RFC
4001, February 2005.
[RFC792] Postel, J., "Internet Control Message Protocol", STD 5, RFC
792, September 1981.
[RFC3489] Rosenberg, J., Weinberger, J., Huitema, C., and R. Mahy,
"STUN - Simple Traversal of User Datagram Protocol (UDP)
Through Network Address Translators (NATs)", RFC 3489,
March 2003.
[RFC2863] McCloghrie, K. and F. Kastenholz, "The Interfaces Group
MIB", RFC 2863, June 2000.
[RFC2463] Conta, A. and S. Deering, "Internet Control Message
Protocol (ICMPv6) for the Internet Protocol Version 6
(IPv6) Specification", RFC 2463, December 1998.
[RFC3411] Harrington, D., Presuhn, R., and B. Wijnen, "An
Architecture for Describing Simple Network Management
Protocol (SNMP) Management Frameworks", STD 62, RFC 3411,
December 2002.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC3413] Levi, D., Meyer, P., and B. Stewart, "Simple Network
Management Protocol (SNMP) Applications", STD 62, RFC 3413,
December 2002.
8.2. Informative References
[RFC1918] Rekhter, Y., Moskowitz, B., Karrenberg, D., de Groot, G.,
and E. Lear, "Address Allocation for Private Internets",
BCP 5, RFC 1918, February 1996.
[RFC3410] Case, J., Mundy, R., Partain, D., and B. Stewart,
"Introduction and Applicability Statements for Internet-
Standard Management Framework", RFC 3410, December 2002.
Authors' Addresses
R. Rohit
Mascon Global Limited
#59/2 100 ft Ring Road
Banashankari II Stage
Bangalore 560 070
India
Phone: +91 80 679 6227
EMail: rrohit74@hotmail.com
P. Srisuresh
Caymas Systems, Inc.
1179-A North McDowell Blvd.
Petaluma, CA 94954
Phone: (707) 283-5063
EMail: srisuresh@yahoo.com
Rajiv Raghunarayan
Cisco Systems Inc.
170 West Tasman Drive
San Jose, CA 95134
Phone: +1 408 853 9612
EMail: raraghun@cisco.com
Nalinaksh Pai
Cisco Systems, Inc.
Prestige Waterford
No. 9, Brunton Road
Bangalore - 560 025
India
Phone: +91 80 532 1300 extn. 6354
EMail: npai@cisco.com
Cliff Wang
Information Security
Bank One Corp
1111 Polaris Pkwy
Columbus, OH 43240
Phone: +1 614 213 6117
EMail: cliffwang2000@yahoo.com
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