root@OpenWrt:/# cat /etc/config/network
config 'interface' 'loopback'
        option 'ifname' 'lo'
        option 'proto' 'static'
        option 'ipaddr' '127.0.0.1'
        option 'netmask' '255.0.0.0'

config 'interface' 'lan_one'
        option 'ifname' 'eth0'
        option 'proto' 'static'

        option 'ipaddr' '192.168.0.3'
        option 'netmask' '255.255.255.0'

config 'interface' 'lan_two'
        option 'ifname' 'eth1'
        option 'proto' 'static'
        option 'ipaddr' '192.168.1.1'
        option 'netmask' '255.255.255.0'
        
config 'interface' 'lan2_three'
        option 'ifname' 'eth2'     
        option 'proto' 'static'                                     
        option 'ipaddr' '192.168.2.1'        
        option 'netmask' '255.255.255.0'

config 'interface' 'wan'
        option 'type'     'bridge'
        option 'ifname' 'eth3 eth4'
        option 'proto' 'static'
        option 'ipaddr' '192.168.111.110'
        option 'netmask' '255.255.255.0'