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M2M Cellular Gateway
peer, the packets whose destination is in the dedicated subnet will be transferred via the L2TP VPN
tunnel. Others will be transferred based on current routing policy of the security gateway at L2TP client
peer. But, if you choose "Default Gateway" option for the L2TP client peer, all packets will be
transferred via the L2TP VPN tunnel. That means the remote L2TP VPN server gateway controls the
flowing of any packets from the L2TP client peer. Certainly, those packets come through the L2TP VPN
tunnel.
Scenario Application Timing
Above diagram illustrates the Security Gateway 2 or the mobile device playing the L2TP
VPN client role. The L2TP tunnel is established by the L2TP client making the tunnel
connection request initiation and the Security Gateway 1 in Network‐A of headquarters
serves as the L2TP VPN server responding to the request. Once the tunnel has been
established, all client hosts behind the Security Gateway 2 or the mobile device can
access the resources in the Intranet of Network‐A at headquarters via this established
L2TP tunnel. Usually, these hosts at L2TP client peer access the Internet directly via the
WAN interface of Security Gateway 2. Only the packets whose destination is in the
dedicated subnet to Network‐A will be transferred via the L2TP tunnel. But if L2TP client
Index skipping is used to reserve slots for new function insertion, when required.
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