SSH Tunnel

• SSH Tunneling describe on wikiPedia
• SSH Tunnels: Bypass (Almost) Any Firewall
• You can secure network traffic that is normally not secure like SMB fileshares (Windows Fileshares)
• The SSH client forwards network traffic destined to a specific port (UDP/TCP) to a remote port and associated IP address through the SSH tunnel on port 22.
• The combination of SSH Tunnel and Proxy Server like Squid are effective since you can SSH tunnel to the system that has the Squid Proxy Server setup, and then access whatever ports you need to by simply accessing the localhost (127.0.0.1:3128) which tunnels to the outside system that has the Squid Proxy on port 3128 from which you access web sites.
• SSH is available on all platforms
  • Ubuntu/Linux (most likely built-in): apt-get install ssh
  • Mac OS X has ssh built-in
  • Windows: Putty and FileZilla
• SSH Commands
  • ssh user@EXT_SVR -L 10025:127.0.0.1:25 -L 10110:127.0.0.1:110 Traffic on localhost 10025 (smtp) and 10110 (pop) show up on EXT_SVR as localhost ports 25 and 110.

-- JeffreyThompson - 28 Feb 2008