M2M IDG500AM-0T001 User Manual page 222

M2M Cellular Gateway
10.0.76.0/24. The security gateway for Network‐A has the IP address of 10.0.76.2 for
LAN interface and 203.95.80.22 for WAN interface. It serves as a L2TP server.
However, Network‐B is in the mobile office and the subnet of its Intranet is
10.0.75.0/24. The security gateway for Network‐B has the IP address of 10.0.75.2 for
LAN interface and 118.18.81.33 for WAN interface. It serves as a L2TP client.
The L2TP client uses "User‐1" user account to dial in the L2TP server at HQ for
establishing a L2TP VPN tunnel. So both Intranets of 10.0.75.0/24 and 10.0.76.0/24 can
securely communicate each other.
Finally, the client hosts in the Intranet of Network‐B at mobile office can access the
server or database resources in the Intranet of Network‐A at HQ in a secured link.
However, if the "Default Gateway/Remote Subnet" parameter in the Security Gateway
2 is configured to "Default Gateway", the Internet accessing of L2TP Client peer also go
through the established L2TP VPN tunnel, and the Security Gateway 1 can control the
accessing as same as the HQ resource accessing.
The L2TP allows user to configure L2TP tunnel
Ensure Configuration are enabled and saved
Go to Advanced Network > VPN > L2TP
When select Server in Client/Server, the L2TP server Configuration will appear.
Index skipping is used to reserve slots for new function insertion, when required.
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