Virtual Private Networks (VPNs)
The problem of remote access has appeared many times in this book. This problem has actually been an important issue throughout the evolution of TCP/IP. How do you connect computers that are not close enough for a LAN-style cable connection? System administrators have always relied on two important methods for remote connections:
Dial-up— A remote user connects through a modem to a dial-up server, which acts as a gateway to the network. (See Hour 8, “Dial-Up TCP/IP.”)
Wide Area Network (WAN)— Two networks are connected through a dedicated leased line connection through a phone company or Internet provider.
These methods are inherently secure, because they establish a closed, private connection that offers no opportunities ...
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