A Poor Man’s VPN: Proxy Web Connection to Remote Server (via SSH and Tunnel)



Did you ever have a situation where you needed to access a website that had an IP restriction in place? I recently had a situation where I needed to access the web via my university connection (due to IP restrictions placed on accessing databases of research papers). They do not have a VPN setup so it is hard to do this off-campus.

I do however have access to a linux machine on campus. I am familiar with port forwarding using SSH but I had never used it to actually tunnel web traffic using a web browser on Windows. Turns out it is surprisingly easy!

The ssh command to use is:

1
ssh -C2qTnN -D 8080 username@remote_host

This command sshes to the remote_host, and creates a tunnel on your localhost, port 8080. Note that you need to have private key authentication already set up for this host – it will not work with password authentication.

The description of the switches are (from the ssh man page):

  • -C : Compression
  • -2 : Use SSHv2
  • -q : quiet!
  • -T : Disable pseuto-tty allocation
  • -n : Prevents reading from stdin (you need to have private key authentication set up, to prevent password authentication)
  • -N : Do not execute a remote command (or launch a shell). Just use the ssh process for port forwarding
  • -D : Allocate a socket to listen on the local side. When a connection is made to this port it is located to the remote machine. Makes SSH work as a SOCKS server. Only root can forward privileged ports like this.

From here, you set up Firefox or your browser of choice to use a Socks proxy on localhost:8080. The man page says that SOCKS4 and SOCK5 should both work but I had to use SOCKS v4, SOCKS v5 did not seem to work for me.

  • Hadar Pedhazur

    This is very cool, thanks. For a single use, meaning for the one purpose you described above, a slightly simpler redirect is with the -L switch to ssh. That way, you don’t change any Firefox prefs (meaning, no SOCKS). You merely surf to localhost:8080, and the one site you specifically want the remote site to bring up magically comes up. I have used that many times.

  • Hadar Pedhazur

    This is very cool, thanks. For a single use, meaning for the one purpose you described above, a slightly simpler redirect is with the -L switch to ssh. That way, you don’t change any Firefox prefs (meaning, no SOCKS). You merely surf to localhost:8080, and the one site you specifically want the remote site to bring up magically comes up. I have used that many times.

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  • sdd

    ok

  • sdd

    ok

  • nizzard

    Don’t forget to set Firefox to use remote DNS as well!

  • nizzard

    Don’t forget to set Firefox to use remote DNS as well!

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