I-D ACTION:draft-richardson-ipsec-pmtu-discov-00.txt

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       Title     : Path MTU discovery in the presence of security gateways 
       Author(s) : M. Richardson
       Filename  : draft-richardson-ipsec-pmtu-discov-00.txt
       Pages     : 7
       Date      : 07/16/1997

This document describes the problem of getting accurate Path MTU 
information in the presence of untrusted routers. Typical Path MTU 
discovery is done by sending packets with the don't fragment bit set, and 
listening for ICMP messages from routers that want to fragment the packets.
Unfortunately, these messages could be forged, and IPsec based security 
system(s) can not pass make direct use of these messages. An alternate, 
backwards compatible algorithm is suggested.                               

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