Packetization Layer Path MTU Discovery for Datagram Transports
RFC 8899, “Packetization Layer Path MTU Discovery for Datagram Transports”, is a Proposed Standard document published in September 2020 by G. Fairhurst, T. Jones, M. Tüxen, I. Rüngeler, T. Völker. It updates RFC 4821, RFC 4960, RFC 6951, RFC 8085, RFC 8261. The canonical text is published by the RFC Editor.
Abstract
This document specifies Datagram Packetization Layer Path MTU Discovery (DPLPMTUD). This is a robust method for Path MTU Discovery (PMTUD) for datagram Packetization Layers (PLs). It allows a PL, or a datagram application that uses a PL, to discover whether a network path can support the current size of datagram. This can be used to detect and reduce the message size when a sender encounters a packet black hole. It can also probe a network path to discover whether the maximum packet size can be increased. This provides functionality for datagram transports that is equivalent to the PLPMTUD specification for TCP, specified in RFC 4821, which it updates. It also updates the UDP Usage Guidelines to refer to this method for use with UDP datagrams and updates SCTP.
The document provides implementation notes for incorporating Datagram PMTUD into IETF datagram transports or applications that use datagram transports.
This specification updates RFC 4960, RFC 4821, RFC 6951, RFC 8085, and RFC 8261.
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 8899 is hosted at rfc-editor.org. Available in HTML,TXT,PDF,XML.
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