![]() ![]() Router(config-if)#ip address 10.3.2.1 255.255.255.0Īlternatively, if you are connecting the router to an external switch via a trunking port, your inside interface may be a subinterface with VLAN tagging, e.g.: Router(config)#int FastEthernet0/1.100 ![]() ![]() Router(config-if)#ip address 12.34.56.78 255.255.255.252Ĭonfigure the interface connected to the Opengear appliance (to the interface selected under IP Passthrough -> Interface) to use DHCP, in this example we are using the ISR 891's Fast Ethernet WAN port (FE 8 aka FastEthernet8): Router(config)#int FastEthernet8Ĭonfigure your LAN interface, in this example we are configuring the LAN to use the default VLAN, connected by the ISR 891's integrated 8-port 10/100 switch ports (FE LAN 0 - 7 aka FastEthernet0-7). Setting up a downstream Cisco router for F2C consists of the following steps:Ĭonfigure the interface connected to the primary ISP, in this example we are configuring the ISR 891's Gigabit Ethernet WAN port (WAN GE 0 aka GigabitEthernet0) with the static IP address of 12.34.56.78/30, allocated by our primary ISP: Router(config)#int GigabitEthernet0 This guide was written using a Cisco ISR 891 running IOS 15.3(1)T as a reference. If not, please start here:īefore continuing, validate that your Cisco router supports the IP SLA feature and is running IOS 12.4T or later. F2C allows your primary site router (often referred to as “downstream router”) to utilize the Opengear’s internal cellular modem as a backup WAN connection. This guide assumes that you are already familiar with how F2C works, and have configured IP Passthrough on your Opengear appliance. ![]()
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