主机IP必须通过DHCP获得，但是因故需要重新指定网关并做策略路由。例如主机DHCP获取IP段192.168.1.0/24，DHCP获取网关192.168.1.1，拟将默认路由改为192.168.1.2，本地IP仍然走网关192.168.1.1
RHEL(CentOS) 6/7
/etc/sysconfig/network-scripts/ifcfg-eth0 BOOTPROTO=dhcp NM_CONTROLLED="no" ONBOOT=yes GATEWAY=192.168.1.2 …… /etc/sysconfig/network-scripts/route-eth0 192.168.0.0/16 via 192.168.1.1 /etc/sysconfig/network NETWORKING=yes ……
Debian 7
/etc/network/interfaces …… up route del default dev eth0 up route add -net 192.168.1.0 netmask 255.255.255.0 gw 192.168.1.1 dev eth0 up route add default gw 192.168.1.2 dev eth0 ……
Suse 11
/etc/sysconfig/network/routes …… 192.168.0.0 192.168.1.1 255.255.0.0 eth0 default 192.168.1.2 - -
