This document describes a robust method for Path MTU Discovery
(PMTUD) that relies on TCP or some other Packetization Layer to probe
an Internet path with progressively larger packets. This method is
described as an extension to RFC 1191 and RFC 1981, which specify
ICMP-based Path MTU Discovery for IP versions 4 and 6, respectively.
This document is a product of the Path MTU Discovery
Working Group of the IETF.
This is now a Proposed Standard Protocol.
STANDARDS TRACK: This document specifies an Internet standards track
protocol for the Internet community,and requests discussion and
suggestions for improvements.Please refer to the current edition of the
Internet Official Protocol Standards (STD 1) for the standardization
state and status of this protocol. Distribution of this memo is
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