RFC 1981              Path MTU Discovery for IPv6            August 1996


Appendix A - Comparison to RFC 1191

   This document is based in large part on RFC 1191, which describes
   Path MTU Discovery for IPv4.  Certain portions of RFC 1191 were not
   needed in this document:

   router specification    - Packet Too Big messages and corresponding
                             router behavior are defined in [ICMPv6]

   Don't Fragment bit      - there is no DF bit in IPv6 packets

   TCP MSS discussion      - selecting a value to send in the TCP MSS
                             option is discussed in [IPv6-SPEC]

   old-style messages      - all Packet Too Big messages report the
                             MTU of the constricting link

   MTU plateau tables      - not needed because there are no old-style
                             messages

References

   [CONG]      Van Jacobson.  Congestion Avoidance and Control.  Proc.
               SIGCOMM '88 Symposium on Communications Architectures and
               Protocols, pages 314-329.  Stanford, CA, August, 1988.

   [FRAG]      C. Kent and J. Mogul.  Fragmentation Considered Harmful.
               In Proc. SIGCOMM '87 Workshop on Frontiers in Computer
               Communications Technology.  August, 1987.

   [ICMPv6]    Conta, A., and S. Deering, "Internet Control Message
               Protocol (ICMPv6) for the Internet Protocol Version 6
               (IPv6) Specification", RFC 1885, December 1995.

   [IPv6-SPEC] Deering, S., and R. Hinden, "Internet Protocol, Version
               6 (IPv6) Specification", RFC 1883, December 1995.

   [ISOTP]     ISO.  ISO Transport Protocol Specification: ISO DP 8073.
               RFC 905, SRI Network Information Center, April, 1984.

   [ND]        Narten, T., Nordmark, E., and W. Simpson, "Neighbor
               Discovery for IP Version 6 (IPv6)", Work in Progress.

   [RFC-1191]  Mogul, J., and S. Deering, "Path MTU Discovery",
               RFC 1191, November 1990.







 
RFC 1981              Path MTU Discovery for IPv6            August 1996


   [RPC]       Sun Microsystems, Inc., "RPC: Remote Procedure Call
               Protocol", RFC 1057, SRI Network Information Center,
               June, 1988.

Authors' Addresses

   Jack McCann
   Digital Equipment Corporation
   110 Spitbrook Road, ZKO3-3/U14
   Nashua, NH 03062