第一生效文件:/etc/sysconfig/network-scripts/ifcfg-eth0
[root@newname ~]# grep -i gate /etc/sysconfig/network-scripts/ifcfg-eth3GATEWAY=192.168.0.1
第二生效文件:/etc/sysconfig/network
[root@newname ~]# grep -i gate /etc/sysconfig/network GATEWAY=192.168.0.1
查看路由命令:route -n,或netstat -rn
[root@oldboy ~]# route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 10.0.2.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth3 169.254.0.0 0.0.0.0 255.255.0.0 U 1002 0 0 eth0 169.254.0.0 0.0.0.0 255.255.0.0 U 1003 0 0 eth3 0.0.0.0 192.168.0.1 0.0.0.0 UG 0 0 0 eth3 [root@oldboy ~]# netstat -rn Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface 10.0.2.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth3 169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0 169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth3 0.0.0.0 192.168.0.1 0.0.0.0 UG 0 0 0 eth3
其中,最后一行为默认网关,不管去哪个网络,都从默认网关192.168.0.1出去。
设置(添加和删除,屏蔽)路由:命令行优先,且临时生效:
添加默认网关 为10.0.0.1 root@text:~# route add default gw 10.0.0.1 删除默认网关 root@text:~# route del default gw 10.0.0.1 添加到主机的路由 root@text:~# route add -host 192.168.10.2 dev eth3 root@text:~# route -n Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.10.2 * 255.255.255.255 UH 0 0 0 eth3 删除到主机的路由 root@text:~# route del -host 192.168.10.2 dev eth3 添加到网络192.168.55.0的路由 root@text:~# route add -net 192.168.55.0 netmask 255.255.255.0 eth3 屏蔽到网路192.168.55.0的路由 route add -net 192.168.55.0 netmask 255.255.255.0 reject 删除到网络的路由 root@text:~# route del -net 192.168.55.0 netmask 255.255.255.0 eth3