A new Request for Comments is now available in online RFC libraries.
RFC 9869
Title: Datagram Packetization Layer Path MTU
Discovery (DPLPMTUD) for UDP Options
Author: G. Fairhurst,
T. Jones
Status: Standards Track
Stream: IETF
Date: October 2025
Mailbox: [email protected],
[email protected]
Pages: 13
Updates/Obsoletes/SeeAlso: None
I-D Tag: draft-ietf-tsvwg-udp-options-dplpmtud-15.txt
URL: https://www.rfc-editor.org/info/rfc9869
DOI: 10.17487/RFC9869
This document specifies how a UDP Options sender implements Datagram
Packetization Layer Path MTU Discovery (DPLPMTUD) as a robust method
for Path MTU Discovery (PMTUD). This method uses the UDP Options
packetization layer. It allows an application to discover the largest
size of datagram that can be sent across a network path. It also
provides a way to allow the application to periodically verify the
current Maximum Packet Size (MPS) supported by a path and to update
this when required.
This document is a product of the Transport and Services Working Group Working
Group of the IETF.
This is now a Proposed Standard.
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 Official
Internet Protocol Standards (https://www.rfc-editor.org/standards) for the
standardization state and status of this protocol. Distribution of this
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