Simple Protocol for Robust IP/*/IP Tunnel Endpoint MTU Determination (sprite-mtu)

Document Type Expired Internet-Draft (individual)
Author Fred Templin 
Last updated 2007-11-16
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


The nominal Maximum Transmission Unit (MTU) of today's Internet has become 1500 bytes, but 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 support larger MTUs. This document specifies a simple protocol for robust IP/*/IP tunnel endpoint MTU determination (sprite-mtu).


Fred Templin (

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