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 From:  Jim McBeath <monowall at j dot jimmc dot org>
 To:  Tim McCullagh <timbo at halenet dot com dot au>
 Cc:  m0n0wall at lists dot m0n0 dot ch
 Subject:  Re: [m0n0wall] Fw: m0n0wall - Using Public IPs no NAT
 Date:  Tue, 16 Dec 2003 20:41:49 -0800
On Wed, Dec 17, 2003 at 07:16:54AM +1000, Tim McCullagh wrote:
> Can anyone point me as to why I can ping the IP 61.xxx.xxx.3 from the
> 203.xxx.xxx.xxx network, yet if I do a traceroute from 203.xxx.xxx.xxx  to
> 61.xxx.xxx.3 it returns
> traceroute to 61.xxx.xxx.3 (61.xxx.xxx.3), 30 hops max, 40 byte packets
>  1  203.xxx.xxx.249 (203.xxx.xxx.249)  3.233 ms  3.474 ms  3.168 ms
>  2  203.xxx.xxx.249 (203.xxx.xxx.249)  8.624 ms  6.799 ms  6.559 ms

The traceroute program may be using UDP packets rather than ICMP packets,
and the UDP packets may be getting filtered by the gateway attached to
your 203.xxx.xxx.xxx network.  If you are running on a Linux system, you
can use the -I option to traceroute to tell it to use ICMP ECHO packets
(same as ping) rather than UDP.  If you are on another OS, check the
documentation for traceroute to see if it has a similar option.