Add Permanent Routes in CentOS

Method One : Using nmcli command line tool

nmcli connection show
nmcli connection modify "connection-name" +ipv4.routes "network address/prefix gateway"
nmcli connection up "connection-name"

Example:
sudo nmcli connection modify "Bond connection 1" +ipv4.routes "172.31.0.0/16 192.168.0.1"
sudo nmcli connection reload
sudo nmcli connection up "Bond connection 1"
sudo nmcli connection show

After running the above commands, you can see the changes in the file:
sudo vim /etc/sysconfig/network-scripts/route-Bond_connection_1
It is the same as method 2, directly making changes to the file.

Method Two : Manually Create Configuration File

configuration file inside the /etc/sysconfig/network-scripts/ directory using the following format.

route-connectioname

For example, if the name of the network connection is "Bond connection 1", then The name of the configuration file should be

route-Bond_connection_1

sudo cat /etc/sysconfig/network-scripts/route-Bond_connection_1

ADDRESS0=172.31.0.0
NETMASK0=255.255.0.0
GATEWAY0=192.168.0.1

Example format:
ADDRESS0=10.0.0.0

NETMASK0=255.255.255.0

GATEWAY0=192.168.1.10

ADDRESS1=192.168.50.10

NETMASK1=255.255.255.255

GATEWAY1=192.168.1.1

Finally, you need to restart the network connection using nmcli command.

sudo nmcli connection reload

sudo nmcli connection up "Bond connection 1"


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