Virtual Private Networks (VPNs)
Chapter 4
Virtual Private Networks (VPNs)
The Netopia Firmware Version 8.4 offers IPsec, PPTP, and ATMP tunneling support for Virtual Private Networks (VPN).
The following topics are covered in this chapter:
•"Overview" on page
•"About PPTP Tunnels" on page
•"About IPsec Tunnels" on page
•"About L2TP Tunnels" on page
•"About GRE Tunnels" on page
•"About ATMP Tunnels" on page
•"Encryption Support" on page
•"ATMP/PPTP Default Profile" on page
•"VPN QuickView" on page
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•"Allowing VPNs through a Firewall" on page
•"Windows Networking Broadcasts" on page
Overview
When you make a long distance telephone call from your home to a relative far away, you are creating a private network. You can hold a conversation, and exchange information about the happenings on opposite sides of the state, or the continent, that you are mutually interested in. When your next door neighbor picks up the phone to call her daughter at college, at the same time you are talking to your relatives, your calls don't overlap, but each is separate and private. Neither house has a direct wire to the places they call. Both share the same lines on the telephone poles (or underground) on the street.
These calls are virtual private networks. Virtual, because they appear to be direct connections between the calling and answering parties, even though they travel over the public wires and switches of the phone company; private, because neither pair of calling and answering parties interacts with the other; and networks, because they exchange information.
Computers can do the same thing; it's called Virtual Private Networks (VPNs). Equipped with a Netopia Router, a single computer or private network (LAN) can establish a private connection with another computer or private network over the public network (Internet).
