THOMSON SpeedTouch, Configuration Manual

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Chapter 7
Routed PPPoA
E-DOC-CTC-20051017-0167 v1.0
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7 Routed PPPoA
Introduction
The Point-to-Point Protocol (PPP) is today’s de-facto standard for making
connections over the Internet Protocol (IP) network. The SpeedTouch™ Routed PPP
over ATM (PPPoA) Packet Service combines the strength of the PPP technology and
its advanced IP routing and address translation features to provide an easy to use,
yet powerful method to access the Internet.
Features
Routed PPPoA has the following features:
An authenticated session concept: it supports authentication, authorization
and accounting.
No PPPoA session client required on the computer(s) (due to the embedded
SpeedTouch™ PPP session client), avoiding special installation procedures.
Allows multiple users to simultaneously share a single IP address if NAPT is
enabled on the PPPoA interface or can hide the IP address if NAT is enabled.
Allows the network to be shielded from the Internet via the SpeedTouch™
programmable firewall.
Allows Intranet connections through an IPSec tunnel.
Allows services such as IPQoS, SIP PBX, ISDN backup, IDS.
Routed PPPoA vs.
connection service
The Routed PPPoA Packet Service relies on the AAL5/RFC2364/PPP Connection
Service to achieve end-to-end connectivity.
For the SpeedTouch™, this amounts to using the PPPoA (PPP over ATM)
Connection Service type. This connection service type implies the encapsulation of
PPP Protocol Data Units (PDUs) in AAL5/ATM.
All SpeedTouch™ products are compliant with RFC2364 “PPP over ATM Adaptation
Layer 5” and support both the VC-MUX and LLC/NLPID method for PDUs.
DSLAM
SpeedTouch™ operating as
DHCP server and
Internet IP Gateway router
PC configured
as DHCP client
Virtual Channel with:
ATM Encapsulation Type: VC-MUX
Connection Service Name: Routed PPPoA
Connection Service Type: PPPoA
BRAS
Internet