about route
route add default dev my_iface1
route del default
route add default gw 192.168.120.1
route add -net 10.210.44.0 netmask 255.255.255.0 dev my_iface1
route del -net 10.210.44.0 netmask 255.255.255.0 dev my_iface1
route add default dev my_iface1
route del default
route add default gw 192.168.120.1
route add -net 10.210.44.0 netmask 255.255.255.0 dev my_iface1
route del -net 10.210.44.0 netmask 255.255.255.0 dev my_iface1