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I have two physical servers in my home network, linux (192.168.8.x) and windows server 2008 (192.168.8.y).

The linux server ist accessible from outside by ssh on a non-standard port (say 23008). How do I establish a permanent RDP tunnel through ssh on the linux box? I know that I can use putty on the outside machine, but I don't know how to set up sshd on the linux box correctly. Thanks for any hints!

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2 Answers 2

up vote 5 down vote accepted

Assuming your linux box is accessible from the internet at 1.2.3.4 on port 23008, on an external system I would do:

external% ssh -p 23008 -L 13389:192.168.8.y:3389 username@1.2.3.4

I'd then connect to the port-forwarded RDP system with

external% rdesktop localhost:13389

If your external box isn't a linux box, there will be equivalent commands for the tools you have; the idea is still the same: to forward external's port 13389 to 192.168.8.y's port 3389, then use external's RDP client to connect to localhost:13389.

You refer to setting up the linux box's sshd correctly, but unless you've reconfigured it, the standard sshd setup is likely to support this just fine.

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You're right, I thought I have to configure sshd to tunnel specific ports. But this is all done with the client command. (ssh or putty on windows). I –  elsni Dec 1 '10 at 16:19
ssh -L 3389:<ip of windows server>:3389 <ip of ssh server> -l <ssh user> -N

Assuming 3389 is the port your RDP is running on AND the ssh server has access to said port, you can then connect to 127.0.0.1:3389 as if it were the remote server.

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is the ip of ssh server the internal or the external one? The external changes daily, but the server is accessible vie dyndns from outside –  elsni Nov 29 '10 at 11:13
    
IN which case: ssh -L 3389:<ip of windows server>:3389 <dydns of ssh server> -l <ssh user> -N hostnames can be used in place of ip's assuming of course you have port 22 forwarding onto the ssh server, which on a side note can be bad, if using a different port and forwarding that on i.e. 1212 use the -p 1212 flag. –  Oneiroi Nov 29 '10 at 12:25
    
<prdp> is rdp port on internal windows server <pssh> is port of public ssh linux server (nonstandard in my case) <ptunnel> is the port for the tunnel <ipwserver> is internal ip adress of windows server. I did a ssh -L<prdp>:<ipwserver>:<ptunnel> myserver.gotdns.com -l myusername -N -p <pssh> correct? –  elsni Nov 30 '10 at 15:47

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