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User Manual
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IBR350
GRE
Generic Routing Encapsulation (GRE) tunnels can be used to create a connection between two private
networks. Most Cradlepoint routers are enabled for both GRE and 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 configure 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.
•
Routes that allow you to configure what network traffic from local host(s) will be allowed through the
tunnel.
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; click Edit to make changes to an existing tunnel.
Add/Edit Tunnel – General
Tunnel Name: Give the tunnel a name that
uniquely identifies it.
Tunnel Key: Enables an ID key for a GRE
tunnel, which can be used as an identifier
for mGRE (Multipoint GRE).
Local Network: This is the local side of
the "Glue Network," a network created
by the administrator to form the tunnel.
The user creates the IP address inputted
here. It must be different from the IP
addresses of the networks it is gluing
together. Choose any private IP address
from the following three ranges that
doesn't match either network:
•
10.0.0.0 - 10.255.255.255
•
172.16.0.0 - 172.31.255.255
•
192.168.0.0 - 192.168.255.255
Remote Network: This is the remote side
of the "Glue Network." Again, the user
must create an IP address that is distinct from the IP addresses of the networks that are being glued together.
The Remote Network and Local Network values will be flipped when inputted for the other side of the tunnel
configuration.
Subnet Mask: This is the subnet mask for the Glue Network. The Local and Remote Network addresses must fit
with this mask. 255.255.255.0 is a logical choice for most users.
Remote Gateway: This is the public facing, WAN-side IP address of the network to which the local gateway is
going to connect.
TTL: Set the Time to Live (TTL), or hop limit, for the GRE tunnel.
MTU: Set the maximum transmission unit (MTU) for the GRE tunnel.
WAN Binding: WAN Binding is an optional parameter used to configure the GRE tunnel to ONLY operate when
the specified WAN device(s) are available and connected. An example use case is when there is a router with
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