To use the 635xx-series router's cellular modem in tandem with its primary WAN Ethernet port, but direct certain IP addresses destinations to go always through the cellular modem's Internet connection.

This article assumes the LAN ports are operating under default settings, which provide DHCP connectivity to devices connected to the 63xx-series router's LAN ports.  For more details on the default settings of the 63xx-series router, see the Default Settings section of the User's Manual.

For this setup, you will need the 63xx-series router with both a primary WAN Ethernet connection, and a cellular modem connection.

The sample configuration below shows a 63xx-series router with two Internet connections: a cellular-based WAN connection through the 63xx-series router's modem, and a broadband-based WAN connection through the 63xx-series router's WAN Ethernet port.  The 63xx-series router's cellular WAN connection will be used to provide access to the 128.136.167.120 IP address, while all other access will be sent through the primary WAN Ethernet connection.

Under Network -> Routes -> Policy-based routing, setup a new policy with the following settings:

1. Interface:  Modem
2. Source address -> Type:  Zone
3. Source address -> Zone:  Internal
4. Destination address -> Type:  IPv4 address
5. Destination address -> IPv4 address:  128.136.167.120