Nortel Networks manual Examples of L2TP Networks, L2TP Network Using a LAC

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L2TP Overview

Examples of L2TP Networks

Figure 1-1 shows an L2TP network that uses a LAC to connect to the LNS. The tunnel is between the LAC and the LNS.

Remote

host

PPP

PC connection

No L2TP functionality

ISP network

LAC

Tunnel

Data

TMS

Frame relay	Corporate network
connection

LNS

RADIUS

server

L2T0003A

Figure 1-1. L2TP Network Using a LAC

Figure 1-2 shows an L2TP network that uses a RAS to connect to the LNS. The tunnel is between the PC (the L2TP client) and the LNS.

Remote

host

Tunnel

PC

L2TP client

ISP network

RAS

Data

Frame relay
connection		Corporate network
		LNS

RADIUS

server

L2T0004A

Figure 1-2. L2TP Network Using a RAS

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Contents Configuring L2TP Services Copyright 1998 Bay Networks, Inc Bay Networks, Inc. Software License Agreement Rev Contents Chapter Starting L2TP Appendix B Configuration Examples Page Figures Page Tables Page Before You Begin PrefaceItalic text Text ConventionsAcronyms Bay Networks Technical Publications How to Get HelpTopic Chapter L2TP OverviewL2TP Benefits What Is Tunneling?L2TP Sessions Remote Host Components of an L2TP NetworkTunnel Management Server TMS L2TP Access Concentrator LACRemote Access Server RAS Radius Server L2TP Network Server LNSExamples of L2TP Networks L2TP Network Using a LACPacket Encapsulation Process L2TP Packet EncapsulationMaking a Connection Across an L2TP Network Security in an L2TP Network Bay Networks L2TP Implementation Tunnel Management Tunnel AuthenticationShows tunnel authentication Radius User Authentication L2TP IP Interface Addresses Radius AccountingRemote Router Dialing the LNS Remote Router ConfigurationIf you want to Go to Where to Go NextPage Chapter Starting L2TP Radius Server Information Tunnel Authentication PasswordsPlanning Considerations for an L2TP Network Choose Local File , Remote File , or Preparing a Configuration FileSite Manager Procedure You do this System responds Tools Choose Configuration ManagerSubnet Mask Enabling L2TP on an Unconfigured WAN InterfaceChoose Add/Delete Enabling L2TP on an Existing PPP InterfaceChoose Edit Circuit Configuring L2TP Services Enabling L2TP on an Existing Frame Relay Interface Configuration is completed Choose Group Protocols Site Manager ProcedureEnabling L2TP on an Existing ATM Interface You do this System respondsChoose Protocols Choose Service AttributesChapter Customizing L2TP Services Choose L2TP Configuration Modifying the L2TP Protocol ConfigurationRadius Server on Modifying Radius Server InformationChanging the LNS System Name Modifying the Number of L2TP Sessions Permitted Set the Remove Domain Name Keeping the Remote User’s Domain NameSet the Domain Name Delimiter Changing the Domain Name DelimiterChoose Tunnel Authentication Enabling Tunnel AuthenticationChoose L2TP IP Interface Modifying L2TP IP Interface AddressesDisabling L2TP Disabling RIPDeleting L2TP from a PPP Interface Customizing L2TP ServicesDeleting L2TP from a Frame Relay Interface Deleting L2TP from an ATM Interface Site Manager Procedure Topic Appendix a L2TP ParametersFigure A-1. L2TP Configuration List Window L2TP Configuration ParametersParameter Receive Window Size Parameter Enable L2TPParameter Max L2TP Sessions Parameter Maximum Retransmit Parameter Retransmit Timer secondsParameter Hello Timer seconds Parameter Radius Primary Server IP Address Parameter Ack Timeout millisecondsParameter LNS System Name Parameter Tunnel Flow Control Parameter Radius Primary Server PasswordParameter Radius Client IP Address Parameter Domain Name Delimiter Parameter Remove Domain NameFigure A-2. L2TP Tunnel Security List Window L2TP Tunnel Security ParametersParameter Tunnel Authentication Password Parameter Enable Tunnel AuthenticationFigure A-3. L2TP IP Interface List Window L2TP IP Interface ParametersParameter Subnet Mask Parameter L2TP IP Interface AddressParameter RIP Enable Example 1 Remote PC Calling the Corporate Network Appendix B Configuration ExamplesFigure B-1. L2TP Network with PCs at the Remote Site Configuring the Remote HostsParameter Name Value IP Address 192.32.16.55 Configuring the LACs and the TMSConfiguring the LNS Domain name baynetworks.comL2TP IP Interface window, enter the L2TP IP address Data Path Through the NetworkFigure B-2. L2TP Network with Routers at the Remote Site Example 2 Remote Router Calling the Corporate NetworkParameter Name Value RFC1661 Compliance Enable Configuring the Dial-on-Demand CircuitConfiguring the PPP Interface Problem What to Do Appendix C TroubleshootingTable C-1 Common L2TP Network Problems and Solutions L2TP IndexIndex-2