Centos7配置临时路由和永久路由

首先使用route -n查看路由表

route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         1.1.1.1  0.0.0.0         UG    100    0        0 enp5s0f0
10.2.0.0        172.20.3.254    255.255.0.0     UG    0      0        0 enp5s0f1

然后查看工作的网卡：

ip add
1: lo:  mtu 65536 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
2: enp5s0f0:  mtu 1500 qdisc mq state UP qlen 1000
    link/ether f4:ce:46:b0:3e:82 brd ff:ff:ff:ff:ff:ff
    inet 1.1.1.1/27 brd 139.220.242.63 scope global enp5s0f0
       valid_lft forever preferred_lft forever
    inet 1.1.1.31/32 scope global enp5s0f0
       valid_lft forever preferred_lft forever
3: enp5s0f1:  mtu 1500 qdisc mq state UP qlen 1000
    link/ether f4:ce:46:b0:3e:83 brd ff:ff:ff:ff:ff:ff
    inet 172.20.3.64/24 brd 172.20.3.255 scope global enp5s0f1
       valid_lft forever preferred_lft forever
    inet 172.20.3.66/32 scope global enp5s0f1
       valid_lft forever preferred_lft forever
4: docker0:  mtu 1500 qdisc noqueue state DOWN 
    link/ether 02:42:74:59:1c:3e brd ff:ff:ff:ff:ff:ff
    inet 10.110.0.1/16 scope global docker0
       valid_lft forever preferred_lft forever

从上面发现处于活动的网卡名称为enp5s0f0，enp5s0f1；我们为其创建对应的路由配置文件。route-enp5s0f1，因为enp5s0f0规划是默认路由出去，故不创建

vim /etc/sysconfig/network-scripts/route-enp5s0f1
10.5.0.0/16 via 172.20.3.254  dev  enp5s0f1

保存退出

systemctl restart network

再次使用route -n查看

route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         139.220.242.33  0.0.0.0         UG    100    0        0 enp5s0f0
10.2.0.0        172.20.3.254    255.255.0.0     UG    0      0        0 enp5s0f1
10.5.0.0        172.20.3.254    255.255.0.0     UG    0      0        0 enp5s0f1

路由表已经在里面了

添加临时路由
注意：临时路由重启网卡后路由会消失

添加一条道10.10.0.0/16的临时路由

route add -net 10.10.0.0/16 gw  172.20.3.254

route -n查看路由表：

route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         139.220.242.33  0.0.0.0         UG    100    0        0 enp5s0f0
10.2.0.0        172.20.3.254    255.255.0.0     UG    0      0        0 enp5s0f1
10.5.0.0        172.20.3.254    255.255.0.0     UG    0      0        0 enp5s0f1
10.10.0.0       172.20.3.254    255.255.0.0     UG    100    0        0 enp5s0f1

路由表已经在里面了