RFC 1853 (rfc1853) - Page 1 of 8


IP in IP Tunneling



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Network Working Group                                         W. Simpson
Request for Comments: 1853                                    Daydreamer
Category: Informational                                     October 1995


                           IP in IP Tunneling


Status of this Memo

   This memo provides information for the Internet community.  It does
   not specify an Internet standard.  Distribution of this memo is
   unlimited.


IESG Note:

   Note that this memo is an individual effort of the author.  This
   document reflects a current informal practice in the internet.  There
   is an effort underway within the IETF Mobile-IP Working Group to
   provide an appropriate proposed standard to address this issue.


Abstract

   This document discusses implementation techniques for using IP
   Protocol/Payload number 4 Encapsulation for tunneling with IP
   Security and other protocols.


Table of Contents

     1.     Introduction ..........................................    2

     2.     Encapsulation .........................................    3

     3.     Tunnel Management .....................................    5
        3.1       Tunnel MTU Discovery ............................    5
        3.2       Congestion ......................................    6
        3.3       Routing Failures ................................    6
        3.4       Other ICMP Messages .............................    6

     SECURITY CONSIDERATIONS ......................................    7
     REFERENCES ...................................................    7
     ACKNOWLEDGEMENTS .............................................    8
     AUTHOR'S ADDRESS .............................................    8





Simpson                      Informational


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