Multicast Path MTU

Document Type Expired Internet-Draft (individual)
Authors tathagata nandy  , Nitin Singla 
Last updated 2020-10-22 (latest revision 2020-04-19)
Stream (None)
Intended RFC status (None)
Expired & archived
pdf htmlized (tools) htmlized bibtex
Stream Stream state (No stream defined)
Consensus Boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Expired
Telechat date
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


Path MTU discovery (rfc1191) is a standard technique to determine the supported MTU between two Internet Protocol (IP) hosts to avoid any fragmentation. In a multicast distribution tree, source will not know where the receivers are located. So the technique used to compute the path MTU for a unicast stream does not work in a multicast network. This document describes a method to discover multicast path MTU with the goal to avoid traffic loss. This solution also aims to solve the problem of traffic loss in for multicast streams because of incorrect MTU setting and no path MTU support for multicast networks.


tathagata nandy (
Nitin Singla (

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