Applicability Statement for the use of IPv6 UDP Datagrams with Zero Checksums
draft-ietf-6man-udpzero-09

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Document Type Active Internet-Draft (6man WG)
Last updated 2013-01-19
Replaces draft-6man-udpzero, draft-fairhurst-tsvwg-6man-udpzero
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Internet Engineering Task Force                             G. Fairhurst
Internet-Draft                                    University of Aberdeen
Intended status: Standards Track                           M. Westerlund
Expires: July 23, 2013                                          Ericsson
                                                        January 19, 2013

  Applicability Statement for the use of IPv6 UDP Datagrams with Zero
                               Checksums
                       draft-ietf-6man-udpzero-09

Abstract

   This document provides an applicability statement for the use of UDP
   transport checksums with IPv6.  It defines recommendations and
   requirements for the use of IPv6 UDP datagrams with a zero UDP
   checksum.  It describes the issues and design principles that need to
   be considered when UDP is used with IPv6 to support tunnel
   encapsulations and examines the role of the IPv6 UDP transport
   checksum.  An appendix presents a summary of the trade-offs that were
   considered in evaluating the safety of the update to RFC 2460 that
   updates use of the UDP checksum with IPv6.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on July 23, 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
   (http://trustee.ietf.org/license-info) in effect on the date of

Fairhurst & Westerlund    Expires July 23, 2013                 [Page 1]
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   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  5
     1.1.  Document Structure . . . . . . . . . . . . . . . . . . . .  6
     1.2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . .  6
     1.3.  Use of UDP Tunnels . . . . . . . . . . . . . . . . . . . .  6
       1.3.1.  Motivation for new approaches  . . . . . . . . . . . .  7
       1.3.2.  Reducing forwarding cost . . . . . . . . . . . . . . .  7
       1.3.3.  Need to inspect the entire packet  . . . . . . . . . .  8
       1.3.4.  Interactions with middleboxes  . . . . . . . . . . . .  8
       1.3.5.  Support for load balancing . . . . . . . . . . . . . .  9
   2.  Standards-Track Transports . . . . . . . . . . . . . . . . . .  9
     2.1.  UDP with Standard Checksum . . . . . . . . . . . . . . . . 10
     2.2.  UDP-Lite . . . . . . . . . . . . . . . . . . . . . . . . . 10
       2.2.1.  Using UDP-Lite as a Tunnel Encapsulation . . . . . . . 10
     2.3.  General Tunnel Encapsulations  . . . . . . . . . . . . . . 11
   3.  Issues Requiring Consideration . . . . . . . . . . . . . . . . 11
     3.1.  Effect of packet modification in the network . . . . . . . 12
       3.1.1.  Corruption of the destination IP address . . . . . . . 13
       3.1.2.  Corruption of the source IP address  . . . . . . . . . 13
       3.1.3.  Corruption of Port Information . . . . . . . . . . . . 14
       3.1.4.  Delivery to an unexpected port . . . . . . . . . . . . 15
       3.1.5.  Corruption of Fragmentation Information  . . . . . . . 16
     3.2.  Where Packet Corruption Occurs . . . . . . . . . . . . . . 18
     3.3.  Validating the network path  . . . . . . . . . . . . . . . 18
     3.4.  Applicability of method  . . . . . . . . . . . . . . . . . 19
     3.5.  Impact on non-supporting devices or applications . . . . . 20
   4.  Constraints on implementation of IPv6 nodes supporting
       zero checksum  . . . . . . . . . . . . . . . . . . . . . . . . 20
   5.  Requirements on usage of the zero UDP checksum . . . . . . . . 22
   6.  Summary  . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
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