SmartFlex
4.13 GRE Tunnels Configuration
GRE is an unencrypted protocol. GRE via IPv6 is not supported.
To open the GRE Tunnel Configuration page, clic k GRE in the Configuration section of the
main menu. The menu item will expand and you will see four separate configuration pages:
1st Tunnel, 2nd Tunnel, 3rd Tunnel and 4th Tunnel. The GRE tunnel function allows you to
create an unencrypted connection between two separate LAN networks. The router allows
you to create four GRE tunnels.
Item Description
Description Description of the GRE tunnel.
Remote IP Address IP address of the remote side of the tunnel.
Remote Subnet IP address of the network behind the remote side of the tunnel.
Remote Subnet Mask Specifies the mask of the network behind the remote side of the
tunnel.
Local Interface IP
Address
IP address of the local side of the tunnel.
Remote Interface IP
Address
IP address of the remote side of the tunnel.
Multicasts Activates/deactivates sending multicast into the GRE tunnel:
• disabled – Sending multicast into the tunnel is inactive.
• enabled – Sending multicast into the tunnel is active.
Pre-shared Key Specifies an optional value for the 32 bit shared key in numeric
format, with this key the router sends the filtered data through
the tunnel. Specify the same key on both routers, otherwise the
router drops received packets.
Table 44: GRE Tunnel Configuration
Attention, the GRE tunnel does not pass through NAT.
The changes in settings will apply after pressing the Apply button.
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