Requirements for IP-in-IP Tunnel MTU Assurance

Document Type Expired Internet-Draft (individual)
Last updated 2006-10-22
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


IP-in-IP tunnels present a Maximum Transmission Unit (MTU) to layer 3 via static prearrangements and/or dynamic MTU determination based on layer 2 ICMP messages, but these methods have known operational limitations that can fail to enforce an assured MTU resulting in degraded performance and communications failures. A method for providing an assured MTU to layer 3 over IP-in-IP tunnels is needed.


Fred Templin (

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