Title: Path MTU discovery
Author(s): J.C. Mogul, S.E. Deering.
Status: DRAFT STANDARD
Date: 01 Nov 1990
Length: 47936
Obsoletes: RFC1063
This memo describes a technique for dynamically discovering the maximum transmission unit (MTU) of an arbitrary internet path. It specifies a small change to the way routers generate one type of ICMP message. For a path that passes through a router that has not been so changed, this technique might not discover the correct Path MTU, but it will always choose a Path MTU as accurate as, and in many cases more accurate than, the Path MTU that would be chosen by current practice.
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