Linux DHCP 下自定义路由和网关

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 - -