IPv6 MIB Revision Design Team Bill Fenner
INTERNET-DRAFT AT&T Research
Expires: August 2003 Keith McCloghrie
Rajiv Raghunarayan (Editor)
Cisco Systems
Juergen Schoenwalder
TU Braunschweig
February 2003
Management Information Base
for the Transmission Control Protocol (TCP)
draft-ietf-ipv6-rfc2012-update-02.txt
Status of this Document
This document is an Internet-Draft and is in full conformance with all
provisions of Section 10 of RFC2026.
Internet-Drafts are working documents of the Internet Engineering Task
Force (IETF), its areas, and its working groups. Note that other
groups may also distribute working documents as Internet-Drafts.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference material
or to cite them other than as "work in progress."
The list of current Internet-Drafts can be accessed at
http://www.ietf.org/ietf/1id-abstracts.txt
The list of Internet-Draft Shadow Directories can be accessed at
http://www.ietf.org/shadow.html.
This document is a product of the IPv6 MIB Revision Design Team.
Comments should be addressed to the editor/authors or the mailing
list at ipng@sunroof.eng.sun.com.
Copyright Notice
Copyright (C) The Internet Society (2001). All Rights Reserved.
Abstract
This memo defines a portion of the Management Information Base (MIB)
for use with network management protocols in the Internet community.
In particular, it describes managed objects used for implementations
of the Transmission Control Protocol (TCP) [RFC793] in an IP version
independent manner.
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Table of Contents
1. The Internet-Standard Management Framework . . . . . . . . . . 2
2. Revision History. . . . . . . . . . . . . . . . . . . . . . . . 2
3. Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4. Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5. Acknowledgements. . . . . . . . . . . . . . . . . . . . . . . . 20
6. Normative References. . . . . . . . . . . . . . . . . . . . . . 20
7. Informative References. . . . . . . . . . . . . . . . . . . . . 20
8. Security Considerations . . . . . . . . . . . . . . . . . . . . 21
9. Editor's Address. . . . . . . . . . . . . . . . . . . . . . . . 22
10. Authors. . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
11. Full Copyright Statement . . . . . . . . . . . . . . . . . . . 23
1. 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].
2. Revision History
Changes from draft-ietf-ipv6-rfc2012-update-01.txt:
23rd February 2003
Changes in this version mainly concentrate on reducing this mib
to a bare minimum update of RFC 2012, enough to satisfy the
needs of IPv6. The actual modifications are listed below.
Scalars tcpHCInSegs and tcpHCOutSegs dropped.
Objects dropped from the tcpConnectionTable include
tcpConnectionInSegs, tcpConnectionOutSegs,
tcpConnectionInOctets, tcpConnectionOutOctets,
tcpConnectionHCInSegs, tcpConnectionHCOutSegs,
tcpConnectionHCInOctets, tcpConnectionHCOutOctets,
tcpConnectionAge and tcpConnectionId.
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Objects dropped from tcpListenerTable include
tcpListenerTimeOuts, tcpListenerEstablished and tcpListenerAge.
Updated compliance statements to reflect the aforementioned
changes.
Changes from draft-ietf-ipv6-rfc2012-update-00.txt:
4th November 2002
Replaced the tcpConnectionStartTime and tcpListenerStartTime
objects with tcpConnectionAge and tcpListenerAge respectively.
Added tcpConnectionRemAddressType as an auxiliary object into
the tcpConnectionTable.
Added new object, tcpConnectionId, to provide a link into the
TCP-ESTATS-MIB.
Included tcpConnectionAge and tcpConnectionProcess into the
tcpConnectionGroup.
Included tcpListenerAge and tcpListenerProcess into the
tcpListenerGroup.
tcpListenerGroup added to the mandatory list for compliance.
Changes from draft-ietf-ipngwg-rfc2012-update-01.txt:
27 June 2002
Replaced all occurrences of the term packets to segments, to be
consistent with the TCP specification.
Added limits to tcpRtoMin, tcpRtoMax and tcpMaxConn.
Added the scalar, tcpListenerTableLastChange.
Updated the description of tcpConnectionLocalAddress - removed
reference to 'listen' state.
Updated the description tcpConnection*Octets to explicitly
indicate whether the count includes the TCP header octets.
Updated the description of tcpConnectionStartTime and
tcpListenerStartTime - added clarifying text.
Renamed tcpConnectionProcessID to tcpConnectionProcess.
Updated the description of tcpListenerTable.
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Updated the description of tcpListenerLocalAddressType to include
unknown (0) as a valid value.
Updated the description of tcpListenerLocalAddress - the value
''h (zero-length octet-string) represents the case wherein an
application is will to accept connections for any IP interface
associated with the node.
Removed tcpListenerRemAddressType.
Removed tcpListenerHCConnectionsTimedOut and
tcpListenerHCConnectionsAccepted. Added them to open issues, to
be added iff deemed required after discussions.
Renamed tcpListenerConnectionsAccepted to tcpListenerEstablished
and tcpListenerConnectionsTimedOut to tcpListenerTimeOuts.
Renamed tcpListenerProcessID to tcpListenerProcess.
Updated compliance statement for the object tcpConnectionState -
support for the value 'deleteTCB (12)' deemed optional.
Added RFC 2790 and RFC 2287 to the References section.
Updated Contact-Info and Editor's address.
Added Authors section.
Changes from draft-ietf-ipngwg-rfc2012-update-00.txt:
14 November 2001
Added HC versions of connection counters.
Added Listener table, with counters for accepted and timed out
connection attempts.
Added tcp{Connection,Listener}ProcessID to index into SYSAPPL-MIB
or HOST-RESOURCES-MIB.
Removed tcpConnectionRemAddrType, it must be the same as
tcpConnectionLocalAddrType.
Changes from draft-ops-rfc2012-update-00.txt
12 Jul 2001
Turned into IPNG WG document
Added tcpCountersGroup for per-connection counters
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Changes from first draft posted to v6mib mailing list:
23 Feb 2001
Made threshold for HC packet counters 1Mpps
Added copyright statements and table of contents
21 Feb 2001 -- Juergen's changes
Renamed tcpInetConn* to tcpConnection*
Updated Conformance info
Added missing tcpConnectionState and tcpConnState objects to
SEQUENCEs
6 Feb 2001
Removed v6-only objects.
Renamed inetTcp* to tcpInet*
Added SIZE restriction to InetAddress index objects. (36 =
32-byte addresses plus 4-byte scope, but it's just a strawman)
Used InetPortNumber TC from updated INET-ADDRESS-MIB
Updated compliance statements.
Added Keith to authors
Added open issues section.
Changes from RFC 2012
Deprecated tcpConnTable
Added tcpConnectionTable
3. Overview
The current TCP-MIB defined in this memo consists of two tables an
a group of scalars:
- The tcp group of scalars reports parameters and statistics of a
TCP protocol engine.
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- The tcpConnectionTable provides access to status information for
all TCP connections handled by a TCP protocol engine. In addition
the table also reports identification of the operating system
level processes which handle the TCP connections.
- The tcpListenerTable provides access to information about all TCP
listening endpoints known by a TCP protocol engine. And similar
to the case of the connection table, the tcpListenerTable also
reports the identification of the operating system level
processes which handle this listening TCP endpoint.
3.1 Relationship to Other MIBs
This section discusses the relationship of this TCP-MIB module to
other MIB modules.
3.1.1 Relationship to RFC1213-MIB
TCP related MIB objects were originally defined as part of the
RFC1213-MIB defined in RFC 1213 [RFC1213]. The TCP related objects
of the RFC1213-MIB were later copied into a separate MIB module and
published in RFC 2012 [RFC2012] in SMIv2 format.
The previous versions of the TCP-MIB both defined the tcpConnTable,
which has been deprecated for basically two reasons:
(1) The tcpConnTable only supports IPv4.
The current approach in the IETF is to write IP version neutral
MIBs rather than having different definitions for various
version of IP. This reduces the amount of overhead when new
objects are introduced since there is only one place to add
them. Hence, the approach taken in RFC 2452 of having separate
tables is not continued.
(2) The tcpConnTable mixes listening endpoints with connections.
It turns out that connections tend to have a different behaviour
and management access pattern compared to listening endpoints.
Splitting the original tcpConnTable into two tables thus allows
to add specific status and statistic objects for listening
endpoints and connections.
3.1.2 Relationship to IPV6-TCP-MIB
The IPV6-TCP-MIB defined in RFC 2452 has been moved to Historic
since the approach of having separate IP version specific tables is
not followed anymore. Implementation of RFC 2452 is thus not
suggested anymore.
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3.1.3 Relationship to HOST-RESOURCES-MIB and SYSAPPL-MIB
The tcpConnectionTable and the tcpListenerTable report the
identification of the operating system level process which handles
a connection or a listening endpoint. The value is reported as an
Unsigned32 which is expected to be the same as the hrSWRunIndex of
the HOST-RESOURCES-MIB [RFC2790] (if the value is smaller than
2147483647) or the sysApplElmtRunIndex of the SYSAPPL-MIB [RFC2287].
This allows managment applications to identify the TCP connections
that belong to an operating system level process which has proven
to be valuable in operational environments.
4. Definitions
TCP-MIB DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY, OBJECT-TYPE, Integer32, Unsigned32,
Gauge32, Counter32, IpAddress, mib-2
FROM SNMPv2-SMI
MODULE-COMPLIANCE, OBJECT-GROUP FROM SNMPv2-CONF
InetAddress, InetAddressType,
InetPortNumber FROM INET-ADDRESS-MIB;
tcpMIB MODULE-IDENTITY
LAST-UPDATED "200302230000Z"
ORGANIZATION "IETF IPv6 MIB Revision Team"
CONTACT-INFO
"Rajiv Raghunarayan (editor)
Cisco Systems Inc.
170 West Tasman Drive
San Jose, CA 95134
Phone: +1 408 853 9612
Email: <raraghun@cisco.com>"
DESCRIPTION
"The MIB module for managing TCP implementations."
REVISION "200302230000Z"
DESCRIPTION
"IP version neutral revision, published as RFC XXXX."
REVISION "9411010000Z"
DESCRIPTION
"Initial SMIv2 version, published as RFC 2012."
REVISION "9103310000Z"
DESCRIPTION
"The initial revision of this MIB module was part of
MIB-II."
::= { mib-2 49 }
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-- the TCP base variables group
tcp OBJECT IDENTIFIER ::= { mib-2 6 }
-- Scalars
tcpRtoAlgorithm OBJECT-TYPE
SYNTAX INTEGER {
other(1), -- none of the following
constant(2), -- a constant rto
rsre(3), -- MIL-STD-1778, Appendix B
vanj(4) -- Van Jacobson's algorithm [VANJ]
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The algorithm used to determine the timeout value used for
retransmitting unacknowledged octets."
::= { tcp 1 }
tcpRtoMin OBJECT-TYPE
SYNTAX Integer32 (0..2147483647)
UNITS "milliseconds"
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The minimum value permitted by a TCP implementation for the
retransmission timeout, measured in milliseconds. More
refined semantics for objects of this type depend upon the
algorithm used to determine the retransmission timeout. In
particular, when the timeout algorithm is rsre(3), an
object of this type has the semantics of the LBOUND
quantity described in RFC 793."
::= { tcp 2 }
tcpRtoMax OBJECT-TYPE
SYNTAX Integer32 (0..2147483647)
UNITS "milliseconds"
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The maximum value permitted by a TCP implementation for the
retransmission timeout, measured in milliseconds. More
refined semantics for objects of this type depend upon the
algorithm used to determine the retransmission timeout. In
particular, when the timeout algorithm is rsre(3), an
object of this type has the semantics of the UBOUND
quantity described in RFC 793."
::= { tcp 3 }
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tcpMaxConn OBJECT-TYPE
SYNTAX Integer32 (-1 | 0..2147483647)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The limit on the total number of TCP connections the entity
can support. In entities where the maximum number of
connections is dynamic, this object should contain the
value -1."
::= { tcp 4 }
tcpActiveOpens OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of times TCP connections have made a direct
transition to the SYN-SENT state from the CLOSED state."
::= { tcp 5 }
tcpPassiveOpens OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of times TCP connections have made a direct
transition to the SYN-RCVD state from the LISTEN state."
::= { tcp 6 }
tcpAttemptFails OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of times TCP connections have made a direct
transition to the CLOSED state from either the SYN-SENT
state or the SYN-RCVD state, plus the number of times TCP
connections have made a direct transition to the LISTEN
state from the SYN-RCVD state."
::= { tcp 7 }
tcpEstabResets OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of times TCP connections have made a direct
transition to the CLOSED state from either the ESTABLISHED
state or the CLOSE-WAIT state."
::= { tcp 8 }
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tcpCurrEstab OBJECT-TYPE
SYNTAX Gauge32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of TCP connections for which the current state
is either ESTABLISHED or CLOSE-WAIT."
::= { tcp 9 }
tcpInSegs OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The total number of segments received, including those
received in error. This count includes segments received
on currently established connections."
::= { tcp 10 }
tcpOutSegs OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The total number of segments sent, including those on
current connections but excluding those containing only
retransmitted octets."
::= { tcp 11 }
tcpRetransSegs OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The total number of segments retransmitted - that is, the
number of TCP segments transmitted containing one or more
previously transmitted octets."
::= { tcp 12 }
tcpInErrs OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The total number of segments received in error (e.g., bad
TCP checksums)."
::= { tcp 14 }
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tcpOutRsts OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of TCP segments sent containing the RST flag."
::= { tcp 15 }
-- { tcp 16 } was used to represent the ipv6TcpConnTable in RFC 2452,
-- which has since been obsoleted. It MUST not be used.
-- The TCP Connection table
tcpConnectionTable OBJECT-TYPE
SYNTAX SEQUENCE OF TcpConnectionEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A table containing information about existing TCP
connections. Note that unlike earlier TCP MIBs, there
is a seperate table for connections in the LISTEN state."
::= { tcp 17 }
tcpConnectionEntry OBJECT-TYPE
SYNTAX TcpConnectionEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A conceptual row of the tcpConnectionTable containing
information about a particular current TCP connection.
Each row of this table is transient, in that it ceases to
exist when (or soon after) the connection makes the
transition to the CLOSED state."
INDEX { tcpConnectionLocalAddressType,
tcpConnectionLocalAddress,
tcpConnectionLocalPort,
tcpConnectionRemAddressType,
tcpConnectionRemAddress,
tcpConnectionRemPort }
::= { tcpConnectionTable 1 }
TcpConnectionEntry ::= SEQUENCE {
tcpConnectionLocalAddressType InetAddressType,
tcpConnectionLocalAddress InetAddress,
tcpConnectionLocalPort InetPortNumber,
tcpConnectionRemAddressType InetAddressType,
tcpConnectionRemAddress InetAddress,
tcpConnectionRemPort InetPortNumber,
tcpConnectionState INTEGER,
tcpConnectionProcess Unsigned32
}
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tcpConnectionLocalAddressType OBJECT-TYPE
SYNTAX InetAddressType
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The address type of tcpConnectionLocalAddress. Only IPv4,
IPv4z, IPv6 and IPv6z address types are expected."
::= { tcpConnectionEntry 1 }
tcpConnectionLocalAddress OBJECT-TYPE
SYNTAX InetAddress (SIZE(0..36))
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The local IP address for this TCP connection."
::= { tcpConnectionEntry 2 }
tcpConnectionLocalPort OBJECT-TYPE
SYNTAX InetPortNumber
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The local port number for this TCP connection."
::= { tcpConnectionEntry 3 }
tcpConnectionRemAddressType OBJECT-TYPE
SYNTAX InetAddressType
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The address type of tcpConnectionRemAddress. Only IPv4,
IPv4z, IPv6 and IPv6z address types are expected."
::= { tcpConnectionEntry 4 }
tcpConnectionRemAddress OBJECT-TYPE
SYNTAX InetAddress (SIZE(0..36))
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The remote IP address for this TCP connection."
::= { tcpConnectionEntry 5 }
tcpConnectionRemPort OBJECT-TYPE
SYNTAX InetPortNumber
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The remote port number for this TCP connection."
::= { tcpConnectionEntry 6 }
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tcpConnectionState OBJECT-TYPE
SYNTAX INTEGER {
closed(1),
listen(2), -- do we need this here???
synSent(3),
synReceived(4),
established(5),
finWait1(6),
finWait2(7),
closeWait(8),
lastAck(9),
closing(10),
timeWait(11),
deleteTCB(12)
}
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"The state of this TCP connection.
The value listen(2) is included only for parallelism to the
old tcpConnTable, and should not be used. A connection in
LISTEN state should be present in the tcpListenerTable.
The only value which may be set by a management station is
deleteTCB(12). Accordingly, it is appropriate for an agent
to return a `badValue' response if a management station
attempts to set this object to any other value.
If a management station sets this object to the value
deleteTCB(12), then this has the effect of deleting the TCB
(as defined in RFC 793) of the corresponding connection on
the managed node, resulting in immediate termination of the
connection.
As an implementation-specific option, a RST segment may be
sent from the managed node to the other TCP endpoint (note
however that RST segments are not sent reliably)."
::= { tcpConnectionEntry 7 }
tcpConnectionProcess OBJECT-TYPE
SYNTAX Unsigned32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The system's process ID for the process associated with
this connection, or zero if there is no such process. This
value is expected to be the same as HOST-RESOURCES-MIB::
hrSWRunIndex or SYSAPPL-MIB::sysApplElmtRunIndex for some
row in the appropriate tables."
::= { tcpConnectionEntry 8 }
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-- The TCP Listener table
tcpListenerTable OBJECT-TYPE
SYNTAX SEQUENCE OF TcpListenerEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A table containing information about TCP listeners. A
listening application can be represented in three
possible ways:
1. An application that is willing to accept both IPv4 and
IPv6 datagrams is represented by
tcpListenerLocalAddressType of unknown (0) and
tcpListenerLocalAddress of ''h (a zero-length
octet-string).
2. An application which is willing to accept only IPv4 or
IPv6 datagrams is represented by a
tcpListenerLocalAddressType of the appropriate address
type and tcpListenerLocalAddress of ''h (a zero-length
octet-string).
3. An application which is a listening for data destined
only to a specific IP address, but from any remote
system, is represented by a tcpListenerLocalAddressType
of an appropriate address type, with
tcpListenerLocalAddress the specific local address.
NOTE: that address type in this table represents the
address type used for the communication, irrespective
of the higher-layer abstraction. For example, an
application using IPv6 'sockets' to communicate via
IPv4 between ::ffff:10.0.0.1 and ::ffff:10.0.0.2 would
use InetAddressType ipv4(1))."
::= { tcp 18 }
tcpListenerEntry OBJECT-TYPE
SYNTAX TcpListenerEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A conceptual row of the tcpListenerTable containing
information about a particular TCP listener."
INDEX { tcpListenerLocalAddressType,
tcpListenerLocalAddress,
tcpListenerLocalPort }
::= { tcpListenerTable 1 }
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TcpListenerEntry ::= SEQUENCE {
tcpListenerLocalAddressType InetAddressType,
tcpListenerLocalAddress InetAddress,
tcpListenerLocalPort InetPortNumber,
tcpListenerProcess Unsigned32
}
tcpListenerLocalAddressType OBJECT-TYPE
SYNTAX InetAddressType
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The address type of tcpListenerLocalAddress. Only IPv4,
IPv4z, IPv6 and IPv6z address types are expected, or
unknown (0) if connection initiation to all local IP
addresses are accepted. "
::= { tcpListenerEntry 1 }
tcpListenerLocalAddress OBJECT-TYPE
SYNTAX InetAddress (SIZE(0..36))
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The local IP address for this TCP connection. In the case
of a listener which is willing to accept connections for
any IP interface associated with the node, a value of ''h
(zero-length octet-string) is used."
::= { tcpListenerEntry 2 }
tcpListenerLocalPort OBJECT-TYPE
SYNTAX InetPortNumber
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The local port number for this TCP connection."
::= { tcpListenerEntry 3 }
tcpListenerProcess OBJECT-TYPE
SYNTAX Unsigned32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The system's process ID for the process associated with
this listener, or zero if there is no such process. This
value is expected to be the same as HOST-RESOURCES-MIB::
hrSWRunIndex or SYSAPPL-MIB::sysApplElmtRunIndex for some
row in the appropriate tables."
::= { tcpListenerEntry 4 }
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-- The deprecated TCP Connection table
tcpConnTable OBJECT-TYPE
SYNTAX SEQUENCE OF TcpConnEntry
MAX-ACCESS not-accessible
STATUS deprecated
DESCRIPTION
"A table containing information about existing IPv4-specific
TCP connections or listeners. This table has been
deprecated in favor of the version neutral
tcpConnectionTable."
::= { tcp 13 }
tcpConnEntry OBJECT-TYPE
SYNTAX TcpConnEntry
MAX-ACCESS not-accessible
STATUS deprecated
DESCRIPTION
"A conceptual row of the tcpConnTable containing information
about a particular current IPv4 TCP connection. Each row
of this table is transient, in that it ceases to exist when
(or soon after) the connection makes the transition to the
CLOSED state."
INDEX { tcpConnLocalAddress,
tcpConnLocalPort,
tcpConnRemAddress,
tcpConnRemPort }
::= { tcpConnTable 1 }
TcpConnEntry ::= SEQUENCE {
tcpConnState INTEGER,
tcpConnLocalAddress IpAddress,
tcpConnLocalPort Integer32,
tcpConnRemAddress IpAddress,
tcpConnRemPort Integer32
}
tcpConnState OBJECT-TYPE
SYNTAX INTEGER {
closed(1),
listen(2),
synSent(3),
synReceived(4),
established(5),
finWait1(6),
finWait2(7),
closeWait(8),
lastAck(9),
closing(10),
timeWait(11),
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deleteTCB(12)
}
MAX-ACCESS read-write
STATUS deprecated
DESCRIPTION
"The state of this TCP connection.
The only value which may be set by a management station is
deleteTCB(12). Accordingly, it is appropriate for an agent
to return a `badValue' response if a management station
attempts to set this object to any other value.
If a management station sets this object to the value
deleteTCB(12), then this has the effect of deleting the TCB
(as defined in RFC 793) of the corresponding connection on
the managed node, resulting in immediate termination of the
connection.
As an implementation-specific option, a RST segment may be
sent from the managed node to the other TCP endpoint (note
however that RST segments are not sent reliably)."
::= { tcpConnEntry 1 }
tcpConnLocalAddress OBJECT-TYPE
SYNTAX IpAddress
MAX-ACCESS read-only
STATUS deprecated
DESCRIPTION
"The local IP address for this TCP connection. In the case
of a connection in the listen state which is willing to
accept connections for any IP interface associated with the
node, the value 0.0.0.0 is used."
::= { tcpConnEntry 2 }
tcpConnLocalPort OBJECT-TYPE
SYNTAX Integer32 (0..65535)
MAX-ACCESS read-only
STATUS deprecated
DESCRIPTION
"The local port number for this TCP connection."
::= { tcpConnEntry 3 }
tcpConnRemAddress OBJECT-TYPE
SYNTAX IpAddress
MAX-ACCESS read-only
STATUS deprecated
DESCRIPTION
"The remote IP address for this TCP connection."
::= { tcpConnEntry 4 }
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tcpConnRemPort OBJECT-TYPE
SYNTAX Integer32 (0..65535)
MAX-ACCESS read-only
STATUS deprecated
DESCRIPTION
"The remote port number for this TCP connection."
::= { tcpConnEntry 5 }
-- conformance information
tcpMIBConformance OBJECT IDENTIFIER ::= { tcpMIB 2 }
tcpMIBCompliances OBJECT IDENTIFIER ::= { tcpMIBConformance 1 }
tcpMIBGroups OBJECT IDENTIFIER ::= { tcpMIBConformance 2 }
-- compliance statements
tcpMIBCompliance2 MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"The compliance statement for systems which implement TCP."
MODULE -- this module
MANDATORY-GROUPS { tcpBaseGroup, tcpConnectionGroup,
tcpListenerGroup }
OBJECT tcpConnectionState
SYNTAX INTEGER { closed(1), listen(2), synSent(3),
synReceived(4), established(5),
finWait1(6), finWait2(7), closeWait(8),
lastAck(9), closing(10), timeWait(11) }
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required, nor is support for the value
deleteTCB (12)."
::= { tcpMIBCompliances 2 }
tcpMIBCompliance MODULE-COMPLIANCE
STATUS deprecated
DESCRIPTION
"The compliance statement for IPv4-only systems which
implement TCP. In order to be IP version independent, this
compliance statement is deprecated in favor of
tcpMIBCompliance2. However, agents are still encouraged
to implement these objects in order to interoperate with
the deployed base of managers."
MODULE -- this module
MANDATORY-GROUPS { tcpGroup }
OBJECT tcpConnState
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
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::= { tcpMIBCompliances 1 }
-- units of conformance
tcpGroup OBJECT-GROUP
OBJECTS { tcpRtoAlgorithm, tcpRtoMin, tcpRtoMax,
tcpMaxConn, tcpActiveOpens,
tcpPassiveOpens, tcpAttemptFails,
tcpEstabResets, tcpCurrEstab, tcpInSegs,
tcpOutSegs, tcpRetransSegs, tcpConnState,
tcpConnLocalAddress, tcpConnLocalPort,
tcpConnRemAddress, tcpConnRemPort,
tcpInErrs, tcpOutRsts }
STATUS deprecated
DESCRIPTION
"The tcp group of objects providing for management of TCP
entities."
::= { tcpMIBGroups 1 }
tcpBaseGroup OBJECT-GROUP
OBJECTS { tcpRtoAlgorithm, tcpRtoMin, tcpRtoMax,
tcpMaxConn, tcpActiveOpens,
tcpPassiveOpens, tcpAttemptFails,
tcpEstabResets, tcpCurrEstab, tcpInSegs,
tcpOutSegs, tcpRetransSegs,
tcpInErrs, tcpOutRsts }
STATUS current
DESCRIPTION
"The group of counters common to TCP entities."
::= { tcpMIBGroups 2 }
tcpConnectionGroup OBJECT-GROUP
OBJECTS { tcpConnectionState, tcpConnectionProcess }
STATUS current
DESCRIPTION
"The group provides general information about TCP
connections."
::= { tcpMIBGroups 3 }
tcpListenerGroup OBJECT-GROUP
OBJECTS { tcpListenerProcess }
STATUS current
DESCRIPTION
"This group has objects providing general information about
TCP listeners."
::= { tcpMIBGroups 4 }
END
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5. Acknowledgements
This document contains a modified subset of RFC 1213 and updates RFC
2012 and RFC 2452. Acknowledgements are therefore due to the authors
and editors of these documents for their excellent work.
6. Normative References
[RFC793] Postel, J., "Transmission Control Protocol - DARPA Internet
Program Protocol Specification", STD 7, RFC 793, DARPA,
September 1981.
[RFC2287] Krupczak, C., Saperia, J., "Definitions of System-Level
Managed Objects for Applications", RFC 2287, February 1998.
[RFC2790] Waldbusser, S., Grillo, P., "Host Resources MIB", RFC 2790,
March 2000.
[RFC2578] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J.,
Rose, M. and S. Waldbusser, "Structure of Management
Information Version 2 (SMIv2)", STD 58, RFC 2578, April
1999.
[RFC2579] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J.,
Rose, M. and S. Waldbusser, "Textual Conventions for SMIv2",
STD 58, RFC 2579, April 1999.
[RFC2580] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J.,
Rose, M. and S. Waldbusser, "Conformance Statements for
SMIv2", STD 58, RFC 2580, April 1999.
[RFC3291] Daniele, M., Haberman, B., Routhier, S., and Schoenwaelder,
J., "Textual Conventions for Internet Network Addresses",
RFC 3291, May 2002.
7. Informative References
[RFC1213] Rose, M. and K. McCloghrie, "Management Information Base
for Network Management of TCP/IP-based internets", RFC 1213,
March 1991.
[RFC2012] K. McCloghrie, "SNMPv2 Management Information Base for the
Transmission Control Protocol using SMIv2", RFC 2012,
November 1996.
[RFC2452] Daniele, M., "IP Version 6 Management Information Base for
the Transmission Control Protocol", RFC 2452, December 1998.
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[RFC3410] Case, J., Mundy, R., Partain, D. and B. Stewart,
"Introduction and Applicability Statements for Internet-
Standard Management Framework", RFC 3410, December 2002.
[VANJ] Jacobson, V., "Congestion Avoidance and Control", SIGCOMM
1988, Stanford, California.
8. Security Considerations
There are management objects defined in this MIB that have a
MAX-ACCESS clause of read-write and/or read-create. Such objects may
be considered sensitive or vulnerable in some network environments.
The support for SET operations in a non-secure environment without
proper protection can have a negative effect on network operations.
These are the tables and objects and their sensitivity/vulnerability:
o The tcpConnectionState and tcpConnState objects have a MAX-ACCESS
clause of read-write, which allows termination of an arbitrary
connection. Unauthorized access could cause a denial of service.
Some of the readable objects in this MIB module (i.e., objects with a
MAX-ACCESS other than not-accessible) may be considered sensitive or
vulnerable in some network environments. It is thus important to
control even GET and/or NOTIFY access to these objects and possibly
to even encrypt the values of these objects when sending them over
the network via SNMP. These are the tables and objects and their
sensitivity/vulnerability:
o The tcpConnectionTable and the tcpConnTable contain objects
providing information on the active connections on the device,
the status of these connections and the associated processes.
This information may be used by an attacker to launch attacks
against known/unknown weakness in certain protocols/applications.
o The tcpListenerTable and the tcpConnTable contain objects providing
information on listeners on an entity. For e.g. the
tcpListenerLocalPort and tcpConnLocalPort objects can be used
to identify what ports are open on the machine and can thus what
attacks are likely to succeed, without the attacker having to run a
port scanner.
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 module.
It is RECOMMENDED that 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).
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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.
9. Editor's Address
Rajiv Raghunarayan
Cisco Systems Inc.
170 West Tasman Drive
San Jose, CA 95134
USA
Email: raraghun@cisco.com
10. Authors
This document is an output of the IPv6 MIB revision team, and
contributors to earlier versions of this document include:
Bill Fenner, AT&T Labs -- Research
Email: fenner@research.att.com
Brian Haberman
Email: bkhabs@nc.rr.com
Shawn A. Routhier, Wind River
Email: sar@epilogue.com
Juergen Schoenwalder, TU Braunschweig
Email: schoenw@ibr.cs.tu-bs.de
Dave Thaler, Microsoft
Email: dthaler@windows.microsoft
This documents updates parts of the MIBs from several documents. RFC
2012 has been the base document for these updations. RFC 2452 was
the first document to define the managed objects for implementations
of TCP over IPv6.
RFC 2012:
Keith McCloghrie, Cisco Systems (Editor)
kzm@cisco.com
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RFC 2452:
Mike Daniele, Compaq Computer Corporation
daniele@zk3.dec.com
11. Full Copyright Statement
Copyright (C) The Internet Society (2002). All Rights Reserved.
This document and translations of it may be copied and furnished to
others, and derivative works that comment on or otherwise explain it or
assist in its implementation may be prepared, copied, published and
distributed, in whole or in part, without restriction of any kind,
provided that the above copyright notice and this paragraph are
included on all such copies and derivative works. However, this
document itself may not be modified in any way, such as by removing the
copyright notice or references to the Internet Society or other
Internet organizations, except as needed for the purpose of developing
Internet standards in which case the procedures for copyrights defined
in the Internet Standards process must be followed, or as required to
translate it into languages other than English.
The limited permissions granted above are perpetual and will not be
revoked by the Internet Society or its successors or assigns.
This document and the information contained herein is provided on an
"AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT
NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL
NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY
OR FITNESS FOR A PARTICULAR PURPOSE.
Raghunarayan, Editor [Page 23]
