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Implications of Oversized IPv6 Header Chains (RFC7112) Disclosure Number: IPCOM000234703D
Original Publication Date: 2014-Jan-01
Included in the Prior Art Database: 2014-Jan-30
Document File: 16 page(s) / 16K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

F. Gont: AUTHOR [+3]


With IPv6, optional internet-layer information is carried in one or more IPv6 Extension Headers [RFC2460]. Extension Headers are placed between the IPv6 header and the Upper-Layer Header in a packet. The term "Header Chain" refers collectively to the IPv6 header, Extension Headers, and Upper-Layer Header occurring in a packet. In those scenarios in which the IPv6 Header Chain is unusually long and packets are fragmented, or scenarios in which the fragment size is very small, the Header Chain may span multiple fragments.

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Internet Engineering Task Force (IETF)                           F. Gont Request for Comments: 7112                           Huawei Technologies Updates: 2460                                                  V. Manral Category: Standards Track                                 Ionos Networks ISSN: 2070-1721                                                R. Bonica                                                         Juniper Networks                                                             January 2014

               Implications of Oversized IPv6 Header Chains


   The IPv6 specification allows IPv6 Header Chains of an arbitrary    size.  The specification also allows options that can, in turn,    extend each of the headers.  In those scenarios in which the IPv6    Header Chain or options are unusually long and packets are    fragmented, or scenarios in which the fragment size is very small,    the First Fragment of a packet may fail to include the entire IPv6    Header Chain.  This document discusses the interoperability and    security problems of such traffic, and updates RFC 2460 such that the    First Fragment of a packet is required to contain the entire IPv6    Header Chain.

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

 Gont, et al.                 Standards Track                    [Page 1]
 RFC 7112         Implications of Oversized Header Chains    January 2014

 Copyright Notice

   Copyright (c) 2014 IETF Trust and the persons identified as the    document authors.  All rights reserved.

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