Figure 6.1, “VPN: PPP tunneled over SSH” demonstrates the use of extending Corporate CIFS (SMB) file services to a remote satellite office securely over the untrusted public Internet.

Figure 6.1. VPN: PPP tunneled over SSH

At the corporate site Port Address Translation (PAT) is used to protect the standard IANA (Internet Assigned Numbers Authority) port assign to the SSH daemon (ie. port: 22 is mapped to port: 20022 on the public Internet side).