Packetization Layer Path MTU Discovery for Datagram Transports
draft-ietf-tsvwg-datagram-plpmtud-14
Internet Engineering Task Force G. Fairhurst
Internet-Draft T. Jones
Updates: 4821, 4960, 8085 (if approved) University of Aberdeen
Intended status: Standards Track M. Tuexen
Expires: 15 August 2020 I. Ruengeler
T. Voelker
Muenster University of Applied Sciences
12 February 2020
Packetization Layer Path MTU Discovery for Datagram Transports
draft-ietf-tsvwg-datagram-plpmtud-14
Abstract
This document describes a robust method for Path MTU Discovery
(PMTUD) for datagram Packetization Layers (PLs). It describes an
extension to RFC 1191 and RFC 8201, which specifies ICMP-based Path
MTU Discovery for IPv4 and IPv6. The method 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 (where packets are discarded). The method can probe a
network path with progressively larger packets to discover whether
the maximum packet size can be increased. This allows a sender to
determine an appropriate packet size, providing functionality for
datagram transports that is equivalent to the Packetization Layer
PMTUD specification for TCP, specified in RFC 4821.
The document updates RFC 4821 to specify the method for datagram PLs,
and updates RFC 8085 as the method to use in place of RFC 4821 with
UDP datagrams. Section 7.3 of RFC4960 recommends an endpoint apply
the techniques in RFC4821 on a per-destination-address basis.
RFC4960 is updated to recommend that SCTP uses the method specified
in this document instead of the method in RFC4821.
The document also provides implementation notes for incorporating
Datagram PMTUD into IETF datagram transports or applications that use
datagram transports.
When published, this specification updates RFC 4821 and RFC 8085.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Fairhurst, et al. Expires 15 August 2020 [Page 1]
Internet-Draft DPLPMTUD February 2020
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This Internet-Draft will expire on 15 August 2020.
Copyright Notice
Copyright (c) 2020 IETF Trust and the persons identified as the
document authors. All rights reserved.
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Please review these documents carefully, as they describe your rights
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1. Classical Path MTU Discovery . . . . . . . . . . . . . . 4
1.2. Packetization Layer Path MTU Discovery . . . . . . . . . 6
1.3. Path MTU Discovery for Datagram Services . . . . . . . . 7
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 8
3. Features Required to Provide Datagram PLPMTUD . . . . . . . . 10
4. DPLPMTUD Mechanisms . . . . . . . . . . . . . . . . . . . . . 13
4.1. PLPMTU Probe Packets . . . . . . . . . . . . . . . . . . 13
4.2. Confirmation of Probed Packet Size . . . . . . . . . . . 14
4.3. Black Hole Detection . . . . . . . . . . . . . . . . . . 15
4.4. The Maximum Packet Size (MPS) . . . . . . . . . . . . . . 15
4.5. Disabling the Effect of PMTUD . . . . . . . . . . . . . . 16
4.6. Response to PTB Messages . . . . . . . . . . . . . . . . 17
4.6.1. Validation of PTB Messages . . . . . . . . . . . . . 17
4.6.2. Use of PTB Messages . . . . . . . . . . . . . . . . . 18
5. Datagram Packetization Layer PMTUD . . . . . . . . . . . . . 19
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