Cradlepoint CBR450 - Manual (Page 80)

CRADLEPOINT
CBR450| USER MANUAL Firmware ver. 3.3.0
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7.3 GRE Tunnels (Advanced Mode only)
Generic Routing Encapsulation (GRE) tunnels can be used to create a connection between two private networks. The
CBR450 is enabled for either GRE or VPN tunnels. GRE tunnels are simpler to configure and more flexible for different
kinds of packet exchanges, but VPN tunnels are much more secure.
In order to set up a tunnel you must know the following:

Local Network and Remote Network addresses for the ―Glue Network,‖ the network that is created by the
administrator that serves as the ―glue‖ between the networks of the tunnel. Each address must be a different IP
address from the same private network, and these addresses together form the endpoints of the tunnel.

Remote Gateway, the public facing WAN IP address that the local gateway is going to connect to.

Optionally, you might also want to enable the tunnel Keep Alive feature to monitor the status of a tunnel and more
accurately determine if the tunnel is alive or not.
Click Add to configure a new GRE tunnel.