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Packetization Layer Path MTU Discovery (PLMTUD) For UDP Transports Using Session Traversal Utilities for NAT (STUN)

Document Type Expired Internet-Draft (tram WG)
Expired & archived
Authors Marc Petit-Huguenin , Gonzalo Salgueiro
Last updated 2021-10-26 (Latest revision 2021-03-28)
Replaces draft-petithuguenin-tram-stun-pmtud
RFC stream Internet Engineering Task Force (IETF)
Intended RFC status Proposed Standard
Additional resources Mailing list discussion
Stream WG state Held by WG
Revised I-D Needed - Issue raised by IESG
Document shepherd Tolga Asveren
Shepherd write-up Show Last changed 2018-04-20
IESG IESG state Expired (IESG: Dead)
Action Holders
Consensus boilerplate Yes
Telechat date (None)
Responsible AD Martin Duke
Send notices to Gonzalo Camarillo <>, Tolga Asveren <>
IANA IANA review state Version Changed - Review Needed

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


The datagram exchanged between two Internet endpoints have to go through a series of physical and virtual links that may have different limits on the upper size of the datagram they can transmit without fragmentation. Because fragmentation is considered harmful, most transports and protocols are designed with a mechanism that permits dynamic measurement of the maximum size of a datagram. This mechanism is called Packetization Layer Path MTU Discovery (PLPMTUD). But the UDP transport and some of the protocols that use UDP were designed without that feature. The Session Traversal Utilities for NAT (STUN) Usage described in this document permits retrofitting an existing UDP-based protocol with such a feature. Similarly, a new UDP-based protocol could simply reuse the mechanism described in this document.


Marc Petit-Huguenin
Gonzalo Salgueiro

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