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M2M Cellular Gateway
The "Configuration" window is to enable the GRE VPN function by checking the Enable box.
GRE Tunnel List
"GRE Tunnel List" window shows all your defined GRE tunnel profiles and parameters include
Tunnel Name, Interface, Operation Mode, IP address of local peer, IP address of remote peer, Key, TTL,
if keep alive or not, tunnel as the Default Gateway or specifying the remote subnet to flow through the
tunnel, and tunnel activation.
GRE Rule Configuration
"GRE Rule Configuration" window can let you specify all parameters for a GRE VPN tunnel. Take a
GRE tunnel between the gateway in headquarters and the one in branch office as an example fo
following description.
GRE Tunnel at HQ Peer
Scenario Application Timing
Above diagram illustrates the security gateway in headquarters playing the GRE server
role. In fact, the GRE tunnel establishment can be started from either site. The GRE
tunnel is established by starting from GRE client, the Security Gateway 2 in Network‐B.
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 GRE tunnel.
Usually, these hosts at GRE 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 GRE tunnel.
Scenario Description
Index skipping is used to reserve slots for new function insertion, when required.
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