Packetization Layer Path MTU Discovery for Datagram Transports

Document Type Replaced Internet-Draft (tsvwg WG)
Authors Gorry Fairhurst  , Tom Jones  , Michael Tüxen  , Irene Ruengeler 
Last updated 2018-01-17 (latest revision 2017-12-06)
Replaced by RFC 8899
Stream Internent Engineering Task Force (IETF)
Intended RFC status (None)
Expired & archived
pdf htmlized (tools) htmlized bibtex
Stream WG state Adopted by a WG
Document shepherd No shepherd assigned
IESG IESG state Replaced by draft-ietf-tsvwg-datagram-plpmtud
Consensus Boilerplate Unknown
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Responsible AD (None)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document describes a robust method for Path MTU Discovery (PMTUD) for datagram Packetization layers. The method allows a Packetization layer (or a datagram application that uses it) to probe an network path with progressively larger packets to determine a maximum packet size. The document describes as an extension to RFC 1191 and RFC 8201, which specify ICMP-based Path MTU Discovery for IPv4 and IPv6. This provides functionally for datagram transports that is equivalent to the Packetization layer PMTUD specification for TCP, specified in RFC4821. When published, this specification updates RFC4821.


Gorry Fairhurst (
Tom Jones (
Michael Tüxen (
Irene Ruengeler (

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