A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Trivial Packetization Layer Path MTU Discovery for IP/*/IP Tunnels
Author(s) : F. Templin
Filename : draft-templin-inetmtu-trivial-01.txt
Pages : 8
Date : 2007-09-28
The nominal Maximum Transmission Unit (MTU) of the Internet has
become 1500 bytes, but existing IP/*/IP tunneling mechanisms impose
an encapsulation overhead that can reduce the effective path MTU to
smaller values. Additionally, existing tunneling mechanisms are
limited in their ability to discover and utilize larger MTUs. This
document specifies a trivial mechanism for tunnel MTU determination
that addresses these issues.1. Introduction
The nominal Maximum Transmission Unit (MTU) of today's Internet has
become 1500 bytes due to the preponderance of networking gear that
configures an MTU of that size. Since not all links in the Internet
configure a 1500 byte MTU, however, packets can be dropped due to an
MTU restriction on the path.
Upper layers see IP/*/IP tunnels as ordinary links, but even for
packets no larger than 1500 bytes these links are susceptible to
silent loss (e.g., due to path MTU restrictions, lost error messages,
layered encapsulations, reassembly buffer limitations, etc.)
resulting in poor performance and/or communications failures
[RFC2923][RFC4459][RFC4821][RFC4963].
This document specifies a trivial mechanism for IP/*/IP tunnel MTU
determination. It updates the functional specifications for Tunnel
Endpoints (TEs) found in existing tunneling mechanisms (see:
Section 9).
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