How do I connect to another computer over the internet via SSH?
Look into this for Mac’s: http://sourceforge.net/projects/macssh/ And into this for Windows: http://www.openssh.com/ You need to install that one a computer in Network B, and then open the port 22 in the firewall on Network B to point to this machine (called NAT Network address translation, or SUA) On the client in Network A, you can then use and SSH Client (e.g. Putty) to connect to the machine in network B.