ip route 可以用於查看網絡的路由信息，並設置路由表
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route n 顯示所有路由
[root@ceph-104 ~]# route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 10.229.37.1 0.0.0.0 UG 101 0 0 enp2s1 10.229.37.0 0.0.0.0 255.255.255.0 U 101 0 0 enp2s1 111.192.168.0 0.0.0.0 255.255.255.0 U 100 0 0 enp2s3 192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 0 virbr0 顯示結果在前的路由優先使用 -
ip route show 查看路由信息
[root@ceph-104 ~]# ip route show default via 10.229.37.1 dev enp2s1 proto static metric 101 10.229.37.0/24 dev enp2s1 proto kernel scope link src 10.229.37.231 metric 101 111.192.168.0/24 dev enp2s3 proto kernel scope link src 111.192.168.104 metric 100 192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1 linkdown -
ip route get ip 查看到達該ip地址的路由信息
[root@ceph-104 ~]# ip route get 111.192.168.101 111.192.168.101 dev enp2s3 src 111.192.168.104 uid 0 cache [root@ceph-104 ~]# -
ip route add/delete
# 添加到主機的路由 [root@ceph-104 ~]# route add -host 目的IP dev 選擇經過的網卡 [root@ceph-104 ~]# route add -host 111.192.168.101 dev enp2s3 [root@ceph-104 ~]# route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 10.229.37.1 0.0.0.0 UG 101 0 0 enp2s1 10.229.37.0 0.0.0.0 255.255.255.0 U 101 0 0 enp2s1 111.192.168.0 0.0.0.0 255.255.255.0 U 100 0 0 enp2s3 111.192.168.101 0.0.0.0 255.255.255.255 UH 0 0 0 enp2s3 # 添加到主機的路由（經過指定網卡） 192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 0 virbr0 [root@ceph-104 ~]# route add -host 目的IP gw 經過的網關 [root@ceph-104 ~]# route add -host 111.192.168.101 gw 111.192.168.1 [root@ceph-104 ~]# route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 10.229.37.1 0.0.0.0 UG 101 0 0 enp2s1 10.229.37.0 0.0.0.0 255.255.255.0 U 101 0 0 enp2s1 111.192.168.0 0.0.0.0 255.255.255.0 U 100 0 0 enp2s3 111.192.168.101 111.192.168.1 255.255.255.255 UGH 0 0 0 enp2s3 # 添加到主機的路由（經過網關） 192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 0 virbr0 #刪除路由 [root@ceph-104 ~]# route del -host 111.192.168.101 刪除一條匹配的路由 route del -host 111.192.168.101 gw 111.192.168.1 刪除匹配的路由 [root@ceph-104 ~]# route del -host 111.192.168.101 dev enp2s3 刪除匹配的路由 # 添加到主機的路由 #添加到某網段的路由 # 增加一條路由信息（發送到10.229.37.0網段的通信包全都要經過10.229.37.1這個網關） [root@ceph-104 ~]# route add -net 10.229.37.0 netmask 255.255.255.0 gw 10.229.37.1 [root@ceph-104 ~]# route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 10.229.37.1 0.0.0.0 UG 101 0 0 enp2s1 10.229.37.0 10.229.37.1 255.255.255.0 UG 0 0 0 enp2s1 # 新增的路由信息 10.229.37.0 0.0.0.0 255.255.255.0 U 101 0 0 enp2s1 111.192.168.0 0.0.0.0 255.255.255.0 U 100 0 0 enp2s3 192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 0 virbr0 # 刪除一條路由信息 [root@ceph-104 ~]# route del -net 10.229.37.0 netmask 255.255.255.0 [root@ceph-104 ~]# route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 10.229.37.1 0.0.0.0 UG 101 0 0 enp2s1 10.229.37.0 0.0.0.0 255.255.255.0 U 101 0 0 enp2s1 111.192.168.0 0.0.0.0 255.255.255.0 U 100 0 0 enp2s3 192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 0 virbr0 #添加到某網段的路由 -
設置永久路由的方法
（1） 在/etc/rc.local里添加
# 配置的路由信息 route add -net 192.168.3.0/24 dev eth0 route add -net 192.168.2.0/24 gw 192.168.3.254（2）在/etc/sysconfig/network里添加到末尾
GATEWAY=gw-ip` 或者 `GATEWAY=gw-dev（3）/etc/sysconfig/static-router :
# 設置靜態路由 any net x.x.x.x/24 gw y.y.y.y