Simple Protocol for Robust Tunnel Endpoint MTU Determination (sprite-mtu) IETF 70 Routing Research Group (RRG) Fred L. Templin [email protected] MTU Determination Problem. End-to-End. Final Destination (EMTU_R=64KB). Tunnel. MTU=64KB. MTU=64KB. Original Source (MTU=64KB).
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Simple Protocol for Robust Tunnel Endpoint
MTU Determination (sprite-mtu)
IETF 70 Routing Research Group (RRG)
Fred L. Templin
1280: safest option
1280 – ~1380: probably safe for most paths
1380 – 1480: safe only if little/no additional encaps
1480 – 1500: only safe if path has larger-than-1500 MTU and TFE has larger-than-minimum EMTU_R
optimizing down to the byte level not always possible
1280 …. 1500