Linux adds a method for permanent static routing

2020-05-24 06:41:17
OfStack

1/5

First let's look at the routing table for the current machine and execute the following command: route-n


[root@vnode33 network-scripts]# route -n
Kernel IP routing table
Destination   Gateway     Genmask     Flags Metric Ref  Use Iface
0.0.0.0     135.252.214.1  0.0.0.0     UG  100  0    0 eth0
135.252.214.0  0.0.0.0     255.255.255.0  U   100  0    0 eth0
172.86.40.0   0.0.0.0     255.255.255.0  U   100  0    0 eth1
192.168.122.0  0.0.0.0     255.255.255.0  U   0   0    0 virbr0

2/5

Then we confirm the current working network card. Here we use eth1.

Addition: if there are multiple network CARDS in the machine, we can specify different static routes for different network CARDS.

eth0, eht2; So the method is like 1, we create 1 corresponding routing configuration file for each network card in turn. route - eth0; route - eth1; route - eth2


[root@vnode33 network-scripts]# ls
ifcfg-eth0     ifcfg-eth1:enodeb2 ifcfg-eth1:mme2 ifdown    ifdown-ib  ifdown-isdn ifdown-routes ifdown-TeamPort ifup-aliases ifup-ib  ifup-isdn  ifup-post  ifup-sit    ifup-tunnel    network-functions
ifcfg-eth1     ifcfg-eth1:gx    ifcfg-eth1:sgi  ifdown-bnep ifdown-ippp ifdown-post ifdown-sit   ifdown-tunnel  ifup-bnep   ifup-ippp ifup-plip  ifup-ppp   ifup-Team   ifup-wireless   network-functions-ipv6
ifcfg-eth1:enodeb1 ifcfg-eth1:mme1   ifcfg-lo     ifdown-eth  ifdown-ipv6 ifdown-ppp  ifdown-Team  ifup       ifup-eth   ifup-ipv6 ifup-plusb ifup-routes ifup-TeamPort init.ipv6-global route-eth1

3/5

Next, let's add a static route through 172.86.40.254 for 172.0.0.0/8

Execute the following command:


vi /etc/sysconfig/network-scripts/route-eth1

Add the following information:

172.0.0.0/8 via 172.86.40.254

Save and exit.

4/5

Then we need to restart the network service for 1 time:


service network restart

5/5

Finally, let's verify 1: route-n; It is found that the routing information has been added to the routing table, and the routing information will not be lost when either the host or the network service is restarted.


[root@vnode33 network-scripts]# route -n
Kernel IP routing table
Destination   Gateway     Genmask     Flags Metric Ref  Use Iface
0.0.0.0     135.252.214.1  0.0.0.0     UG  100  0    0 eth0
135.252.214.0  0.0.0.0     255.255.255.0  U   100  0    0 eth0
172.0.0.0    172.86.40.254  255.0.0.0    UG  100  0    0 eth1
172.86.40.0   0.0.0.0     255.255.255.0  U   100  0    0 eth1
192.168.122.0  0.0.0.0     255.255.255.0  U   0   0    0 virbr0