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IPv6 and UDP Checksums for Tunneled Packets (RFC6935) Disclosure Number: IPCOM000227014D
Original Publication Date: 2013-Apr-01
Included in the Prior Art Database: 2013-May-02
Document File: 24 page(s) / 29K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

M. Eubanks: AUTHOR [+2]


This document constitutes an update of the IPv6 specification [RFC2460] for cases where a tunnel protocol uses UDP with IPv6 to tunnel packets. With the rapid growth of the Internet, tunnel protocols have become increasingly important to enable the deployment of new protocols. Tunnel protocols can be deployed rapidly, while the time to upgrade and deploy a new protocol on a critical mass of routers, middleboxes, and hosts on the global Internet is now measured in decades. At the same time, the increasing use of firewalls and other security-related middleboxes means that truly new tunnel protocols, with new protocol numbers, are also unlikely to be deployable in a reasonable time frame. The result is an increasing interest in and use of UDP-based tunnel protocols. In such protocols, there is an encapsulated "inner" packet, and the "outer" packet carrying the tunneled inner packet is a UDP packet, which can pass through firewalls and other middleboxes that perform the filtering that is a fact of life on the current Internet.

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Internet Engineering Task Force (IETF)                        M. Eubanks Request for Comments: 6935                            AmericaFree.TV LLC Updates: 2460                                                P. Chimento Category: Standards Track               Johns Hopkins University Applied ISSN: 2070-1721                                       Physics Laboratory                                                            M. Westerlund                                                                 Ericsson                                                               April 2013

               IPv6 and UDP Checksums for Tunneled Packets


   This document updates the IPv6 specification (RFC 2460) to improve    performance when a tunnel protocol uses UDP with IPv6 to tunnel    packets.  The performance improvement is obtained by relaxing the    IPv6 UDP checksum requirement for tunnel protocols whose header    information is protected on the "inner" packet being carried.    Relaxing this requirement removes the overhead associated with the    computation of UDP checksums on IPv6 packets that carry the tunnel    protocol packets.  This specification describes how the IPv6 UDP    checksum requirement can be relaxed when the encapsulated packet    itself contains a checksum.  It also describes the limitations and    risks of this approach and discusses the restrictions on the use of    this method.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force    (IETF).  It represents the consensus of the IETF community.  It has    received public review and has been approved for publication by the    Internet Engineering Steering Group (IESG).  Further information on    Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,    and how to provide feedback on it may be obtained at

Eubanks, et al.              Standards Track                    [Page 1]
 RFC 6935         IPv6/UDP Checksums for Tunneled Packets      April 2013

 Copyright Notice

   Copyright (c) 2013 IETF Trust and the persons identified as the    document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal    Provisions Relating to IETF Documents    ( in effect on the date of    publication of this document.  Please review these documents  ...