From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mauricio Tavares <raubvogel@gmail.com>
Subject: Re: newbie: forward rule to itself
Date: Wed, 27 Oct 2010 15:47:36 -0400
Message-ID: <4CC881D8.3060408@gmail.com>
References: <4CC8774C.1070908@gmail.com> <alpine.LNX.2.01.1010272116580.19157@obet.zrqbmnf.qr>
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On 10/27/2010 03:17 PM, Jan Engelhardt wrote:
> On Wednesday 2010-10-27 21:02, Mauricio Tavares wrote:
>
>> 	Let's say I have server1 with two ports, eth0 and eth0, and server2
>> whose eth0 port is connected to server1's eth1. And let's say the subnet
>> between them is 192.168.1.0/24 while the one server1's eth0 is connected to is
>> 192.168.4.0/24.
>>
>> I have the following rules to forward port 6969 coming on eth0 on server1 to
>> port 6969 on server2's eth0:
>>
>> iptables -A PREROUTING -t nat -p tcp --dport 6969 -j DNAT --to
>> 192.168.1.server2:6969
>> iptables -A INPUT -d 192.168.4.server1 -p tcp -m tcp -m state --state NEW
>> --dport 6969 -j ACCEPT
>> iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
>>
>> Any machine in 192.168.4.0/24 seems to be able to get to server2 by using
>> 192.168.1.server1:6969. But, if I try to connect to 192.168.1.server1:6969 on
>> server1 itself, I will not be forwarded to server2. What am I missing here?
>
> That prerouting only applies to packets coming from devices connected to
> the machine.

	How would the prerouting that applies to packets coming from the 
machine itself look like?