On Router 1 interface GigabitEthernet0/0/0Router(config-if)#ip address 10.10.30.1 255.255.255.0Router(config-if)#ip address 10.10.20.1 255.255.255.0 secondaryRouter(config)#ip route 0.0.0.0 0.0.0.0 10.10.20.2 On Router 2 Router(config-if)#ip address ...