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To setup a GRE tunnel, each peer needs to setup its global IP as the tunnel IP and fill in the other's global IP as remote IP.
Each peer must further specify the Remote Subnet item. This is for the Intranet of GRE server peer. At the GRE client peer,
the packets whose destination is in the dedicated subnet will be transferred via the GRE tunnel. Others will be transferred
based on current routing policy of the router at GRE client peer. If you entered 0.0.0.0/0 in the Remote Subnet field, it will be
treated as a "Default Router" setting for the GRE client peer and all packets will go through the established GRE tunnel. That
means the remote GRE server peer controls the flow of any packets from the GRE client peer.
If the GRE server supports DMVPN Hub function, like a Cisco router as the VPN concentrator, the GRE client can activate the
DMVPN spoke function here since it is implemented by GRE over IPSec tunnelling.
6.1.5.1
Enable GRE
To enable the GRE functionality:
1
Select VPN from the Security submenu and click the GRE tab.
2
Go to the Configuration section:
NTC-400 Series
Figure 274 – GRE Tunnel Scenario
Figure 275 – Enable GRE Tunnel
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