手动设置服务器的路由
route add -net 192.168.4.0/24 gw 192.168.4.1 dev eth0
注意：手动添加的路由，服务器重启后不生效；可以把上面的语句添加到开机自启动文件中/etc/rc.local；
vim /etc/network/interfaces
auto eth0
iface eth0 inet static
address 61.129.111.222
netmask 255.255.255.248
gateway 61.129.111.221
auto eth1
iface eth1 inet static
address 192.168.10.144
netmask 255.255.255.0
gateway 192.168.10.254