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I have 3 machines: Router 192.168.229.4 Server 192.168.229.2 Client 192.168.229.3

on the server there is a TCP file server running on port 1234. I want to redirect all the client-server-client traffic via the router machine. Using iptables I was able to do some redirection. The client send the request and it redirect it to the router but the server answer directly to the client.

Those are the commands: On the client 192.168.229.3:

 iptables -t nat -A OUTPUT -p tcp --dport 1234 -j DNAT --to-destination 192.168.229.4

On the router:

iptables -t nat -A PREROUTING -p tcp --dport 1234 -j DNAT --to-destination 192.168.229.2:1234

What should be the command to run on the server?

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I think all you are missing is on the router:

iptables -t nat -A POSTROUTING -j MASQUERADE

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