From mboxrd@z Thu Jan  1 00:00:00 1970
From: Pascal Hambourg <pascal.mail@plouf.fr.eu.org>
Subject: Re: Trouble shooting for port forwarding ,	Want to make sure port
 is forwarded
Date: Tue, 01 Aug 2006 12:23:36 +0200
Message-ID: <44CF2BA8.50106@plouf.fr.eu.org>
References: <20060801094234.35522.qmail@web55506.mail.re4.yahoo.com>
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To: Netfilter IPtableMailinglist <netfilter@lists.netfilter.org>

Hello,

John Joseph a =E9crit :
> Hi=20
>     For the purpose of trouble shooting  , one  setup
> which I had done  for redirecting port 110 to port
> 8110 ( same machine)  . For this purpose   I gave the
> command as=20
>=20
> iptables -t nat -A PREROUTING  -p tcp --dport 110 -j
> REDIRECT --to-port  8110
>=20
>    Now after this . When I do a tcpdump for port 8110
> , I do not get any results , when I  access port 110=20

This is normal. Tcpdump sees the incoming original packets when they=20
arrive at the interface, before they are DNATed or REDIRECTed by=20
iptables in the PREROUTING chain.