Packetization Layer Path MTU Discovery
RFC 4821, “Packetization Layer Path MTU Discovery”, is a Proposed Standard document published in March 2007 by M. Mathis, J. Heffner. It has since been updated by RFC 8899. The canonical text is published by the RFC Editor.
Abstract
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. [STANDARDS-TRACK]
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
The canonical text of RFC 4821 is hosted at rfc-editor.org. Available in TXT,HTML.
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