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I am trying to set up a UDP tunnel over SSH but it doesn't work.

Machine A is under Windows Machine B is running Linux

I want to connect (voice over IP) from machine A to machine B via UDP with protocol SIP.

  1. On machine A I did : socat.exe udp4-listen:5060,reuseaddr,fork tcp:127.0.0.1:10000

  2. On machine B I did socat tcp4-listen:10002,reuseaddr,fork UDP:127.0.0.1:5060

  3. On machine A I did also : SSH tunnel from machine A, port 10000 to machine B port 10002

But it doesn't seem to work, at least according to a SIP VOIP phone I am trying to use ?

Any suggestion would be welcomed :-)

Denis BUCHER
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  • yes it's not a duplicate, I want to do the same but it doesn't work – Denis BUCHER Oct 31 '13 at 17:51
  • Can you give us anything else beyond "it doesn't work". Are you sure your SSH tunnel is setup correctly? What other tests have you run? Can you try running the socat commands without the tunnel, just sending the output of one directly to the input of the other? – heavyd Oct 31 '13 at 18:48
  • Also, please note some of the comments in the duplicate question, that this method can break the UDP stream, which might be happening too. I found in my trials that it was a pretty fragile implementation and that a true VPN is a much more robust. – heavyd Oct 31 '13 at 18:50
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    Why don't you just use OpenVPN? At this point, it is much less than a headache. – MariusMatutiae Oct 31 '13 at 19:32
  • I cannot try to run the socat commands without the tunnel because I am not currently located on the network as machine B. But next week I will be able to try and keep you informed. When I say that it doesn't work the problem is that the VOIP phone is not giving much information, but I also tried udptrace.exe... For the SSH tunnel, yes it is correctly set up, I use many tunnels everyday, but i't the first time I try socat. My question was more about "is it correct to do as I did, is there any error in my commands ?" – Denis BUCHER Nov 01 '13 at 09:33
  • ...and yes I saw your comment about the pretty fragile implementation. But for OpenVPN, I never saw a VPN working well, in my life, whether open or commercial, it's always very bugged. If it works it is also very fragile. Maybe I only had bad experience with it, and others use it everyday, but until now I consider VPN more as a myth ;) – Denis BUCHER Nov 01 '13 at 09:35
  • But I will try OpenVPN anyway ;) – Denis BUCHER Nov 01 '13 at 14:52

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