Pppoe; Pppoe In Action; Benefits Of Pppoe; Traditional Dial-Up Scenario - Nortel 252 Configuration

Appendix D

PPPoE

PPPoE in action

An ADSL modem bridges a PPP session over Ethernet (PPP over Ethernet, RFC
2516) from your PC to an ATM PVC (Permanent Virtual Circuit), which connects
to a DSL Access Concentrator where the PPP session terminates (see
One PVC can support any number of PPP sessions from your LAN. PPPoE
provides access control and billing functionality in a manner similar to dial-up
services using PPP.

Benefits of PPPoE

PPPoE offers the following benefits:
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•
•

Traditional dial-up scenario

Figure 151
traditional dial-up networking.
It provides you with a familiar dial-up networking (DUN) user interface.
It lessens the burden on the carriers of provisioning virtual circuits all the way
to the ISP on multiple switches for thousands of users. For GSTN (PSTN and
ISDN), the switching fabric is already in place.
It allows the ISP to use the existing dial-up model to authenticate and
(optionally) to provide differentiated services.
depicts a typical hardware configuration in which the PCs use
Nortel Business Secure Router 252 Configuration — Advanced
249
Figure 151).