临时路由，机器重启后消失：

route add –host 192.168.4.2 dev eth0:1
route add –net 192.168.4.0/24 gw 192.168.4.250

route add –net 192.168.4.0 netmask 255.255.255.0 gw 192.168.4.250

route del –host 192.168.4.2 dev eth0:1
route del –net 192.168.4.0/24 192.168.4.250

route del–net 192.168.4.0 netmask 255.255.255.0 gw 192.168.4.250

永久路由，编辑或增加、配置文件：

/etc/sysconfig/static-routes

any net 172.22.0.0/16 gw 172.22.4.254
any net 192.168.0.0/16 gw 172.22.4.254