IP Version 6 Management Information Base for the Transmission Control Protocol
RFC 2452
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RFC - Historic
(December 1998; No errata)
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Michael Daniele
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2017-04-18
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RFC 2452 (Historic)
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Network Working Group M. Daniele
Request for Comments: 2452 Compaq Computer Corporation
Category: Standards Track December 1998
IP Version 6 Management Information Base
for the Transmission Control Protocol
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 (1998). All Rights Reserved.
Abstract
This document is one in the series of documents that define various
MIB objects for IPv6. Specifically, this document is the MIB module
which defines managed objects for implementations of the Transmission
Control Protocol (TCP) over IP Version 6 (IPv6).
This document also recommends a specific policy with respect to the
applicability of RFC 2012 for implementations of IPv6. Namely, that
most of managed objects defined in RFC 2012 are independent of which
IP versions underlie TCP, and only the TCP connection information is
IP version-specific.
This memo defines an experimental portion of the Management
Information Base (MIB) for use with network management protocols in
IPv6-based internets.
1. Introduction
A management system contains: several (potentially many) nodes, each
with a processing entity, termed an agent, which has access to
management instrumentation; at least one management station; and, a
management protocol, used to convey management information between
the agents and management stations. Operations of the protocol are
carried out under an administrative framework which defines
authentication, authorization, access control, and privacy policies.
Daniele Standards Track [Page 1]
RFC 2452 TCP MIB for IPv6 December 1998
Management stations execute management applications which monitor and
control managed elements. Managed elements are devices such as
hosts, routers, terminal servers, etc., which are monitored and
controlled via access to their management information.
Management information is viewed as a collection of managed objects,
residing in a virtual information store, termed the Management
Information Base (MIB). Collections of related objects are defined
in MIB modules. These modules are written using a subset of OSI's
Abstract Syntax Notation One (ASN.1) [1], termed the Structure of
Management Information (SMI) [2].
2. Overview
This document is one in the series of documents that define various
MIB objects, and statements of conformance, for IPv6. This document
defines the required instrumentation for implementations of TCP over
IPv6.
3. Transparency of IP versions to TCP
The fact that a particular TCP connection uses IPv6 as opposed to
IPv4, is largely invisible to a TCP implementation. A "TCPng" did
not need to be defined, implementations simply need to support IPv6
addresses.
As such, the managed objects already defined in [TCP MIB] are
sufficient for managing TCP in the presence of IPv6. These objects
are equally applicable whether the managed node supports IPv4 only,
IPv6 only, or both IPv4 and IPv6.
For example, tcpActiveOpens counts "The number of times TCP
connections have made a direct transition to the SYN-SENT state from
the CLOSED state", regardless of which version of IP is used between
the connection endpoints.
Stated differently, TCP implementations don't need separate counters
for IPv4 and for IPv6.
4. Representing TCP Connections
The exception to the statements in section 3 is the tcpConnTable.
Since IPv6 addresses cannot be represented with the IpAddress syntax,
not all TCP connections can be represented in the tcpConnTable
defined in [TCP MIB].
Daniele Standards Track [Page 2]
RFC 2452 TCP MIB for IPv6 December 1998
This memo defines a new, separate table to represent only those TCP
connections between IPv6 endpoints. TCP connections between IPv4
endpoints continue to be represented in tcpConnTable [TCP MIB]. (It
is not possible to establish a TCP connection between an IPv4
endpoint and an IPv6 endpoint.)
A different approach would have been to define a new table to
represent all TCP connections regardless of IP version. This would
require changes to [TCP MIB] and hence to existing (IPv4-only) TCP
implementations. The approach suggested in this memo has the
advantage of leaving IPv4-only implementations intact.
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