IPv6 and UDP Checksums for Tunneled Packets (RFC6935)
Original Publication Date: 2013-Apr-01
Included in the Prior Art Database: 2013-May-02
Internet Society Requests For Comment (RFCs)
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.
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 http://www.rfc-editor.org/info/rfc6935.
al. Standards Track [Page 1]
RFC 6935 IPv6/UDP Checksums for Tunneled Packets April 2013
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