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2 Setup
The setup in this document details setting up a LAIC (LAC Inbound) connection to an LNS. This is
specifically done as the C-router or G-router will then initiate the connection to the LNS, and the
LNS will handle the authentication. As cellular network operators may choose to save on IP
addresses by utilizing NAT, then assigning so-called private IP addresses to mobile devices, this
will allow for a VPN connection without the mobile device requiring a public IP address.
For authentication purposes, a RADIUS server is assumed, but the implementation is left to the
customer. Note that after all settings have been changed, the C-router/G-router will need to be
rebooted in order for the changes to take effect.
Figure 1: Setting up a LAC Inbound connection to a L2TP Network Server
2.1 Configuring the L2TP Setup
The Cisco router is deployed using the sample configuration below, important text is in bold.
version 12.3
service timestamps debug datetime msec localtime show-timezone year
service timestamps log datetime msec localtime show-timezone year
no service password-encryption
!
hostname l2tp
!
boot-start-marker
boot system flash c2600-advsecurityk9-mz.123-26.bin
boot-end-marker
!
enable secret 0 SECRET
!
no network-clock-participate slot 1
no network-clock-participate wic 0
aaa new-model
!
!
aaa session-id common
ip subnet-zero
ip cef
!
!
!
ip audit po max-events 100
The information contained in this document is subject to change. This document contains proprietary information, which is protected by copyright
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without prior written consent of RFI Engineering B.V.
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