From mboxrd@z Thu Jan  1 00:00:00 1970
From: Simon Lodal <simonl@parknet.dk>
Subject: DNAT hiding routers behind it
Date: Fri, 06 Aug 2004 19:25:13 +0200
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I am traceroute'ing a DNAT'ed host. Surprisingly, all routers between 
the DNAT'ing firewall and the host appear as the IP address I am 
traceroute'ing. Is this intended? Can it be controlled in some way? (it 
is not necessarily bad)

Example:
traceroute to 217.116.235.62 (217.116.235.62), 30 hops max, 38 byte packets
  1  192.168.0.2 (192.168.0.2)  4.152 ms  0.875 ms  0.865 ms
  2  217.116.235.62 (217.116.235.62)  1.928 ms  1.272 ms  1.430 ms
  3  217.116.235.62 (217.116.235.62)  2.013 ms  2.338 ms  2.330 ms

Line 1: DNAT'ing firewall.
Line 2: A router.
Line 3: DNAT'ed host.

I would the expect the router to show up with it's own IP address, not 
the original target address.


Simon