A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Path MTU Discovery Working Group of the IETF.
Title : Path MTU Discovery
Author(s) : M. Mathis, J. Heffner
Filename : draft-ietf-pmtud-method-05.txt
Pages : 31
Date : 2005-10-25
This document describes a robust method for Path MTU Discovery that
relies on TCP or some other Packetization Layer to probe an Internet
path with progressively larger packets. This method is described as
an extension to RFC 1191 and RFC 1981, which specify ICMP based Path
MTU Discovery for IP versions 4 and 6, respectively.
The general strategy of the new algorithm is to start with a small
MTU and search upward, testing successively larger MTUs by probing
with single packets. If the probe is successfully delivered and
satisfies a subsequent verification phase then the MTU is raised. If
the probe is lost, it is treated as an MTU limitation and not as a
congestion signal.
There are several options for integrating PLPMTUD with classical path
MTU discovery. PLPMTUD can be minimally configured to perform ICMP
black hole recovery to increase the robustness of classical path MTU
discovery, or ICMP processing can be completely disabled, and PLPMTUD
can completely replace classical path MTU discovery.
In the latter configuration, PLPMTUD exactly parallels congestion
control. An end-to-end transport protocol adjusts non-protocol
properties of the data stream (window size or packet size) while
using packet losses to deduce the appropriateness of the adjustments.
This technique seems to be more philosophically consistent with the
end-to-end principle than relying on ICMP messages containing
transcribed headers of multiple protocol layers.
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