IPv6 Universal Extension Header
draft-gont-6man-ipv6-universal-extension-header-00

headers" would actually be new Subtypes (assigned by IANA) of the
   UEH.

   As a result, in the event an unrecognized Next Header value is
   encountered by a node, the node will be able to assume that such Next
   Header value identifies an upper-layer protocol, rather than an
   extension header.

6.  IANA Considerations

   IANA is requested to create a new registry to maintain the Universal
   Extension Header Subtypes [IANA-UEH].

7.  Security Considerations

   Enabling middle-boxes such as firewalls to inspect the entire IPv6
   header chain even in the presence of unrecognized extensions allows
   for security mechanisms to be implemented, and for proper functioning
   of of other middle-boxes such as load-balancers.

8.  Acknowledgements

   The authors would like to thank [TBD] for providing valuable input on
   earlier versions of this document.

9.  Contributors

   C.M. Heard identified the problems related with the Uniform Format
   for IPv6 Extension Headers specified in [RFC6564], and participated
   in the brainstorming that led to this document.

10.  References

10.1.  Normative References

   [RFC2460]  Deering, S. and R. Hinden, "Internet Protocol, Version 6
              (IPv6) Specification", RFC 2460, December 1998.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC6564]  Krishnan, S., Woodyatt, J., Kline, E., Hoagland, J., and
              M. Bhatia, "A Uniform Format for IPv6 Extension Headers",
              RFC 6564, April 2012.

   [RFC7045]  Carpenter, B. and S. Jiang, "Transmission and Processing
              of IPv6 Extension Headers", RFC 7045, December 2013.

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10.2.  Informative References

   [I-D.ietf-6man-oversized-header-chain]
              Gont, F., Manral, V., and R. Bonica, "Implications of
              Oversized IPv6 Header Chains", draft-ietf-6man-oversized-
              header-chain-09 (work in progress), November 2013.

   [I-D.taylor-v6ops-fragdrop]
              Jaeggli, J., Colitti, L., Kumari, W., Vyncke, E., Kaeo,
              M., and T. Taylor, "Why Operators Filter Fragments and
              What It Implies", draft-taylor-v6ops-fragdrop-02 (work in
              progress), December 2013.

   [GONT-IEPG]
              Gont, F., "Fragmentation and Extension Header Support in
              the IPv6 Internet", IEPG 88, November 3, 2013. Vancouver,
              BC, Canada, 2013, <http://www.iepg.org/2013-11-ietf88/
              fgont-iepg-ietf88-ipv6-frag-and-eh.pdf>.

   [IANA-IP-PROTO]
              Internet Assigned Numbers Authority, "Assigned Internet
              Protocol Numbers", April 2011, <http://www.iana.org/
              assignments/protocol-numbers/protocol-numbers.xhtml>.

   [IANA-UEH]
              Internet Assigned Numbers Authority, "Universal Extension
              Header Subtypes", 2014.

Authors' Addresses

   Fernando Gont
   SI6 Networks / UTN-FRH
   Evaristo Carriego 2644
   Haedo, Provincia de Buenos Aires  1706
   Argentina

   Phone: +54 11 4650 8472
   Email: fgont@si6networks.com
   URI:   http://www.si6networks.com

   Will (Shucheng) Liu
   Huawei Technologies
   Bantian, Longgang District
   Shenzhen  518129
   P.R. China

   Email: liushucheng@huawei.com

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