[Bug 92] New: ICMP type 3 code 4 message generation - incorrect address generation on some NATed connections

[bugzilla-daemon@netfilter.org]

https://bugzilla.netfilter.org/cgi-bin/bugzilla/show_bug.cgi?id=92

           Summary: ICMP type 3 code 4 message generation - incorrect
                    address generation on some NATed connections
           Product: netfilter/iptables
           Version: linux-2.4.x
          Platform: i386
        OS/Version: RedHat Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: unknown
        AssignedTo: laforge@netfilter.org
        ReportedBy: jeff@folts.com
                CC: netfilter-buglog@lists.netfilter.org


On an SNAT (and maybe DNAT as well) connection, any path mtu discovery messages
(icmp type=3 code=4) generated from traffic going from the destination back to
the source need to set the DST address in the payload of the pmtud message to
the translated address instead of the orginal address.

The recipient of the pmtud message needs to see the translated address instead
of the pre-translated original address to be able to associate the pmtud message
with the connection.



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