THOMSON SpeedTouch, Руководство по настройке

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Chapter 5
Routed PPPoE
E-DOC-CTC-20051017-0167 v1.0
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5 Routed PPPoE
Introduction
The Point-to-Point Protocol (PPP) is today’s de-facto standard for making
connections towards the Internet. The Routed PPP over Ethernet (PPPoE) Packet
Service is a second method to create point-to-point links next to the Routed PPPoA
Packet Service. Similar to Routed PPPoA, Routed PPPoE combines the strength of
the PPP technology and the advanced IP routing and address translation features of
the SpeedTouch™ to provide an easy to use, yet powerful method to access the
Internet.
Features
Routed PPPoE has the following features:
A point-to-point Dial-In access method over a virtual Ethernet segment
An authenticated session concept: it supports authentication, authorization
and accounting.
No PPPoE session client required on the computer(s) (thanks due to the
embedded SpeedTouch™ PPP session client), avoiding special installation
procedures.
Multiple users sharing simultaneously a single IP address if NAPT is enabled
on the PPPoE interface or can hide the IP address if NAT is enabled.
The network can 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 PPPoE vs.
connection service
The Routed PPPoE Packet Service relies on the AAL5/RFC2684/Bridged Connection
Service to achieve end-to-end connectivity.
This connection service type implies the encapsulation of Ethernet frames (often
referred to as IEEE802.3, MAC frames or Bridging frames) in AAL5/ATM.
All SpeedTouch™ products are compliant with RFC2684 “Multi-protocol
Encapsulation over ATM Adaptation Layer 5” and support both the LLC/SNAP and
VC-MUX method for Routed Ethernet V2.0/IEEE802.3 PPP Protocol Data Units
(PDUs). However, by default the encapsulation method is set to LLC/SNAP.
DSLAM
SpeedTouch™ operating as
DHCP server and
Internet IP Gateway router
PC configured
as DHCP client
Virtual Channel with:
ATM Encapsulation Type: LLC/SNAP
Connection Service Name: Routed PPPoE
Connection Service Type: PPPoE
BRAS
Internet
Private IP address
Private IP
address
Private DHCP
server
NAPT