How to Create Permanent Static Routes with rt_table on Rocky Linux 9

To make a static route permanent under Rocky Linux 9 with rt_table, follow these steps:

1. Create a new file in the /etc/sysconfig/network-scripts/ directory with a name that follows the pattern route--<table_number>. For example, if you want to create a static route for eth0 using table 200, you would create a file named route-eth0-200.

2. Edit the file and add the static route using the following syntax:

   <destination_network>/ via <gateway_ip> dev

   For example, to add a static route for the network 192.168.10.0/24 via the gateway 192.168.1.1 on eth0, you would add the following line:

   192.168.10.0/24 via 192.168.1.1 dev eth0

3. Save the file and exit.

4. Restart the network service to apply the changes:

   systemctl restart network

5. Verify that the static route is added to the routing table using the following command:

   ip route show table <table_number>

   For example, to show the routes in table 200, you would run:

   ip route show table 200

6. To make sure the route persists after a system reboot, add the following line to the /etc/iproute2/rt_tables file:

   <table_number> <table_name>

   For example, to add table 200 with the name 'mytable', you would add the following line:

   200 mytable

7. Save the file and exit.

8. Restart the network service again to apply the changes:

   systemctl restart network

9. Verify that the static route is still present in the routing table after a reboot by running the same command as in step 5.