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Old 10-19-2004, 11:48 PM   #1
podollb
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Registered: Oct 2003
Location: Grand Forks, ND
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ssh port forwarding (tunneling?) question


Hi,
I have a server that only has the ssh port 22 open. I need to get access to port 4163 and 80. Is there a way to port forward those ports to my local system? What I am needing to do is run a daemon that communicates on those ports and I don't know how to go about that...
 
Old 10-20-2004, 12:52 AM   #2
fblucher
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Not sure what you're trying to do here. Is this something like it?


_______ ________
| | | |
_______| Machine|___________| Machine |
| A | | B |
--------- -----------

Machine A has port 22 open. You want to be able to pass traffice through Machine A, to get to ports 4163 and 80 on Machine B. Is this what you're trying to do? We need to know a bit more about the machines.

If Machine B is on a private IP range then iptables and DNAT will probably do what you want.

Hope that helps,
Finn.
 
Old 10-20-2004, 12:53 AM   #3
fblucher
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Well I'm pleased that my ascii art got screwed up.
 
Old 10-20-2004, 01:01 AM   #4
podollb
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Well actually after I posted I started thinking about it and my problem is complicated. It is a cluster so:

master node (two eth interfaces)
one to the outside world
one to the worker nodes

The master node only allows 22 incoming, but there is a port that the workers use 4160 and 80 that I want access to outside of the cluster.
 
Old 10-20-2004, 01:12 AM   #5
fblucher
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Ah,
I actually read your question with my eyes this time ;o) and now see that you want to do it with SSH port forwarding. Yes SSH can do port forwarding but how will you differentiate between which destination port you want to send to? How will you say that "this traffic needs to go to port 80 on my machine" or "this traffic needs to go to port 4160"? You can get ssh to bind and forward other ports on your master node, so then port 81 would forward through to port 80 on the internal network and port 4161 would forward to port 4160, but only within your SSH session.

You can use SSH to run up a quick and dirty VPN, or setup a proper VPN aswell. Lots of stuff. Tell us more about the nature of the connections on the inside.

Seeya,
Finn.
 
  


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