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Old 03-08-2004, 06:58 AM   #1
Adriaan
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Registered: Aug 2003
Location: Netherlands
Distribution: redhat 9
Posts: 4

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Port forwarding for ssh


I want to connect to my home computer that is behind a computer serving as router. The proxy server at my work only accepts connections on port 80.
Now I am trying to set up port forwarding on my router, so an incoming connection on port 80 gets forwarded to port 22 on my own computer.

First of all, do you people think this is the right way to do it?

Second, this is my first experience with iptables, which rules do I need to give the router?

These are probably rather straight (port) forward issue but it is giving me a hard time. I thought I had port forwarding enabled but when trying to connect using putty I keep on getting: 503 Service unavailable

Thanks in advance

Adriaan
 
Old 03-08-2004, 09:11 AM   #2
peter_robb
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Registered: Feb 2002
Location: Szczecin, Poland
Distribution: Gentoo, Debian
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iptables -t nat -A PREROUTING -i eth~ -s x.x.x.x -p tcp --dport 80 -j DNAT --to-destination y.y.y.y:22
iptables -A FORWARD -s x.x.x.x -p tcp --dport 22 -d y.y.y.y -j ACCEPT

Depending on your chain POLICY, you may need the 2nd rule.
x.x.x.x is your office ip number
y.y.y.y is the machine you want to talk to

Rules need to be in a correct order... so -A puts them at the end, -I puts them first.
It may not be correct, so play with them at rule 1 (-I) and move them later to follow your protection rules.
 
  


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