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POwith iptables forwarding port to other client but with recognition of original sender ip
 

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    <p>I have a firewall (based on iptables) at dedicated ubuntu server. I have several LAN Clients.</p> <p>At one of my LAN Clients I am running software where I can restrict acces based on IP. For me it is important that I can restrict that by using WAN IPs so not LAN IPs.</p> <p>I have configured my firewall so that a/one port is forwarded to a LAN client which work good (solution found at stackoverflow). So far no problems.</p> <p>However at the LAN client I do not see the IP of external sender but - I think due to the forwarding - the client sees that the packet is coming from my LAN server.</p> <p>Question is: how to forward a port on my server to another LAN IP with different port, but so that the LAN client recognizes the external IP of the packet.</p> <p>Lets make it more clear:</p> <p>server LAN IP: 192.168.1.10 server port: 8080</p> <p>should be forwarded to: client LAN IP: 192.168.1.20 client LAN port: 8000</p> <p>With iptables I have:</p> <pre><code>iptables -t nat -A PREROUTING -p tcp -i eth0 --dport 8080 -d 192.168.1.10 -j DNAT --to 192.168.1.20:8000 iptables -A FORWARD -p tcp -d 192.168.1.20 --dport 8000 -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT iptables -t nat -A POSTROUTING -p tcp --dport 8000 -d 192.168.1.20 -j SNAT --to 192.168.1.10 </code></pre> <p>As written that works, but when f.i. someone at IP 88.77.66.55 sends a packet then my LAN client (192.168.1.20) sees that the packet is coming from my LAN server (192.168.1.10) and unfortunately not from 88.77.66.55.</p> <p>Can I fix that...?</p>
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