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RFC 1191 - Path MTU discovery

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Individual Internet-Draft

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RFC 1191: Path MTU discovery

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https://datatracker.ietf.org/doc/rfc1191/

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IETF Datatracker

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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. [STANDARDS-TRACK]

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