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M2M Cellular Gateway
beneath the "Configuration" window. Then configure parameters on another gateway to take another
role. Above diagram is the server role configuration and following diagram shows the client role
configuration.
When you want to configure "L2TP Server" role for the security gateway, there are 4 more
configuration windows: "L2TP Server Configuration", "L2TP Server Status", "User Account List" and
"User Account Configuration". However, when you want to configure "L2TP Client" role for the security
gateway, there are 3 more configuration windows: "L2TP Client Configuration", "L2TP Client List &
Status" and "Configuration for A L2TP Client".
Configuration
The "Configuration" window is to enable the L2TP VPN function by checking the Enable box. In the
"Client/Server" field of the "Configuration" window choose either "Server" or "Client". Choose Server
to define the gateway as the L2TP VPN server for remote clients to initiate the connection to establish
VPN tunnels. Or choose Client to create multiple L2TP VPN clients to establish VPN tunnels to remote
gateways. Moreover, the security gateway serves as the L2TP VPN client and server simultaneously.
L2TP VPN Server Scenario
When you want the security gateway to play a L2TP server role, check the "Enable" box and
choose "Server" option in the "L2TP Configuration" window. And make its related configuration in
following sessions. Also refer to the above server role diagram.
L2TP Server Configuration
In the "L2TP Server Configuration" window you will enable L2TP server function and decide if you
want L2TP Server to support L2TP over IPSec connection and assign the IPSec authentication pre‐
shared key; then specify the virtual IP address of L2TP server, define the pool of virtual IP addresses
that will assign to remote L2TP clients dialing in the security gateway, and the authentication protocol.
Once you select "MS‐CHAP" or "MS‐CHAP v2" for the authentication protocol, you also can specify if
Index skipping is used to reserve slots for new function insertion, when required.
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