Port forwarding not working

Neil Aggarwal neil at JAMMConsulting.com
Mon Apr 30 04:11:29 CEST 2007


Jim:

That did it!  I guess the Linksys box was only going
to respond to local IP addresses.

I was able to use your example to set up the routing for
the gre protocol as well.

Thank you for your help.

	Neil

--
Neil Aggarwal, (832)245-7314, www.JAMMConsulting.com
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-----Original Message-----
From: netfilter-bounces at lists.netfilter.org
[mailto:netfilter-bounces at lists.netfilter.org] On Behalf Of Jim Laurino
Sent: Sunday, April 29, 2007 9:40 AM
To: netfilter at lists.netfilter.org
Subject: Re: Port forwarding not working

On 04/29/2007 09:06:44 AM, Neil Aggarwal - neil at JAMMConsulting.com wrote:
> Jim:
> 
> > Maybe you could use SNAT to make the packets appear
> > to come from the firewall, then they ought to come back. 
> 
> How do I set up the SNAT rule?
> 

This will make the packet look like it came from the firewall:

/sbin/iptables -t nat -I POSTROUTING -o eth1 -d $LINKSYS_VPN_IP \ 
  -p tcp --dport 1723 -j SNAT --to-source 192.168.1.1

(where 192.168.1.1 is the ip address of the firewall on eth1 side)

If postrouting still has a default drop policy etc.
then this rule must be found before the accept rule,
that is why it has -I, to put it first.

HTH
-- 
Jim Laurino
nfcan.x.jimlaur at dfgh.net
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