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Minimal Packetization Layer Path MTU Discovery for IP/*/IPv4 Tunnels

Document Type Expired Internet-Draft (individual)
Expired & archived
Author Fred Templin
Last updated 2007-09-26
RFC stream (None)
Intended RFC status (None)
Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Expired
Telechat date (None)
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


The nominal Maximum Transmission Unit (MTU) of the Internet has become 1500 bytes, but existing IP/*/IPv4 tunneling mechanisms impose an encapsulation overhead that can reduce the effective path MTU to smaller values. Additionally, existing IP/*/IPv4 tunneling mechanisms are limited in their ability to discover and utilize larger MTUs. This document specifies minimal mechanisms for conveying packets over IP/*/IPv4 tunnels that address these issues.


Fred Templin

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)