A、route add -net 192.168.1.0 netmask 255.255.255.128 dev eth0
B、route add 192.168.1.0 netmask 255.255.255.128 gw 172.16.1.1 dev eth0
C、route add -net 192.168.1.0 netmask 255.255.255.0 gw 172.16.1.1 dev eth0
D、route add 192.168.1.0 netmask 255.255.255.192 gw 172.16.1.1 dev eth0