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Re: iptables forwarding question



try 0:9999

----- Original Message ----- 
From: "James Pifer" <jep obrien-pifer com>
To: "Fedora" <fedora-list redhat com>
Sent: Friday, March 17, 2006 8:18 AM
Subject: iptables forwarding question


> Is it possible to forward all traffic, not just a port, that comes from
> a specific ip address to another address? Let's say you're running
> iptables on a machine that is acting as a router on an internal network,
> so traffic by port is not blocked. 
> 
> I've been searching for rules and everything I'm finding is forwarding a
> specific port. Is this possible? If so, an example rule(s) would be
> appreciated.
> 
> If interested, more in depth explanation below. 
> 
> Thanks,
> James
> 
> I'm using pptpclient to connect to another network using LAN to LAN.
> After the connection I have eth0 and ppp0. pptpclient automatically sets
> up iptables rules for the routes and masquarade. This pc is also setup
> to act as a router. I'm trying to get an ipphone working over this
> connection.
> 
> I found a firmware upgrade for the phone that updates it to
> support NAT. That was a huge piece of the puzzle, but I think I still
> have a NAT issue. For background here's how I understand the phone to
> work in our environment.
> 
> The phone does registration and call setup with server1.
> Once a call is placed, or the line is picked up (to hear dial tone for
> example), it's turned over to server2.
> 
> In my case all communication with server1 works great. My phone gets the
> time, it rings if someone calls me, and I can even ring someone else,
> although I hear nothing.
> 
> Using ethereal I can see the packets coming back from server2 and
> hitting ppp0, but it's like my machine doesn't know what to do with the
> packets. I'm thinking maybe when the call is turned over to server2,
> that it's not correctly sending the packets with NAT in mind? I don't
> know NAT to that depth so it's a shot in the dark.
> 
> So I know the packets coming from server2 are destined for the phone, so
> I was hoping I could just try routing/forwarding them to the phone's ip
> address.
> 
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