Avaya Configuring and Troubleshooting Bay Dial VPN (DVS) Networks Uživatelský manuál Strana 5

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303509-A Rev 00 v
Contents
Preface
Before You Begin .............................................................................................................xv
Text Conventions ............................................................................................................. xv
Acronyms ........................................................................................................................xvii
Bay Networks Technical Publications ..............................................................................xix
How to Get Help ..............................................................................................................xix
Chapter 1
Tunneling Overview
Bay Dial VPN Overview ..................................................................................................1-1
What Is Tunneling? .........................................................................................................1-2
Layer 3 Tunneling ...........................................................................................................1-4
Layer 2 Tunneling ...........................................................................................................1-4
Comparing Layer 3 and Layer 2 Features ......................................................................1-4
How a Dial VPN Network Functions ...............................................................................1-5
Dial VPN Network Components .....................................................................................1-7
Remote Dial-In Nodes ..............................................................................................1-7
ISP Network Components for Layer 3 Tunnels ........................................................1-8
Network Access Server (NAS) ..........................................................................1-8
Gateway .............................................................................................................1-9
Tunnel Management Server (TMS) .................................................................1-10
ISP Network Components for Layer 2 Tunnels ......................................................1-10
L2TP Access Concentrator (LAC) ...................................................................1-11
Remote Access Server (RAS) .........................................................................1-11
Tunnel Management Server (TMS) .................................................................1-11
Customer/Home/Internet Service Provider Network ..............................................1-11
Customer Premise Equipment (CPE) ..............................................................1-11
L2TP Network Server (LNS) ............................................................................1-12
RADIUS Authentication Server ........................................................................1-12
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