RFC 2454 (rfc2454) - Page 2 of 9

IP Version 6 Management Information Base for the User Datagram Protocol

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RFC 2454                    UDP 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 UDP over
   IPv6.

3.  Transparency of IP versions to UDP

   The fact that UDP is carried over IPv6 as opposed to IPv4, is largely
   invisible to a UDP implementation.  A "UDPng" did not need to be
   defined, implementations simply need to support IPv6 addresses.

   As such, the managed objects already defined in [UDP MIB] are
   sufficient for managing UDP 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, udpInDatagrams counts "The total number of UDP datagrams
   delivered to UDP users", regardless of which version of IP is used to
   deliver any of those datagrams.

   Stated differently, UDP implementations don't need separate counters
   for IPv4 and for IPv6.

4.  Representing UDP Listeners

   The exception to the statements in section 3 is the udpTable.  Since
   IPv6 addresses cannot be represented with the IpAddress syntax, not
   all UDP endpoints can be represented in the udpTable defined in [UDP
   MIB].

   This memo defines a new, separate table to represent only those UDP
   endpoints that utilize an IPv6 address.  UDP endpoints on IPv4
   addresses continue to be represented in udpTable [UDP MIB].




Daniele                     Standards Track
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