User`s guide

Prestige 128+ ISDN Router
10-2 L2TP
10.2 Advantages of L2TP:
♦ Users can take advantage of the low cost of the Internet. Instead of making a
long-distance call to connect directly with the corporate site’s remote access
server, remote users dial in to a local ISP and use the Internet to handle all
long-distance connections.
♦ The protocol provides virtual dial-up because the user doesn’t really dial in
to the corporate network, but when the connection is complete, it’s as if he
does. This enables outsourcing of dial-up services to the ISP to support
remote users.
♦ Because PPP framing is used, remote users can access corporate sites using a
variety of protocols such as IP, IPX and so on.
♦ The corporate site assigns an IP address to a remote client instead of the ISP,
allowing it to control the assignment of IP addresses.
♦ L2TP provides end-system transparency, meaning that the remote user does
not require any special software to use the service in a secure way.
♦ An organization can control the authentication of users instead of the ISP.
10.3 How L2TP Works
Figure 10-1 How L2TP works