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rocket_doge_
Asked: 2016-05-21 04:27:15 +0800 CST

Tunnel / Forward connections on server 1 to server 2

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I have now spent some time researching, but I haven't found a working solution to the following problem:

I want to tunnel any requests on server 1, port x to server 2, port x. The port stays the same, I just want to tunnel any data being sent to server 1 on port x to server 2.

The connection would look like this:

Client > Server 1 >tunnel> Server 2

and reverse:

Server 2 >tunnel> Server1 > Client

Is that possible? If yes, how? The servers are both running Debian 8.

Please excuse me if this is a total noob question, but I am just getting started with servers and stuff.

Thanks ^^

debian proxy port-forwarding linux-networking tunnel

1 Answers

  1. Best Answer

    This is called Proxy(ing). Yes this is possible by enabling the forwarding module on server1 and then add the appropriate forwarding rules on your iptables.

    For example:

    *On server1:
    Enable Forwading: 

    echo "1" > /proc/sys/net/ipv4/ip_forward  
sysctl net.ipv4.ip_forward=1

    Add forwarding Rules on Iptables 

    iptables -t nat -A PREROUTING --dst server1_ip -p tcp --dport portX -j DNAT --to-destination server2_ip:portX
iptables -t nat -A POSTROUTING -p tcp --dst server2_ip --dport portX -j SNAT --to-source server1_ip
iptables -t nat -A OUTPUT --dst server1_ip -p tcp --dport portX -j DNAT --to-destination server2_ip:portX

    where:
    portX: The port you wish to forward
    server1_ip: Server ip which receives initial ip and forwards to server2.
    server2_ip: The ip address of the server you wish to forward the traffic to.

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