4.4. Configuring Static Routes with ip commands
4.4. Configuring Static Routes with ip commands As a system administrator, you can configure static routes using the ip route command. To display the IP routing table, use the ip route command. For example: The ip route commands take the following form: ip route [ add | del | change | append | replace ] destination-address See the ip-route(8) man page for more details on the options and formats. To add a static route to a host address, in other words to a single IP address: where 192.0.2.1 is the IP address of the host in dotted decimal notation, 10.0.0.1 is the hop address and interface is the exit interface leading to the hop. To add a static route to a network, in other words to an IP address representing a range of IP addresses: where 192.0.2.0 is the IP address of the destination network in dotted decimal notation and /24 is the network prefix. The network prefix is the number of enabled bits in the subnet mask. This format of network address slash network prefix length is sometimes referred to as classless inter-domain routing ( CIDR ) notation. To remove the assigned static route: Any changes that you make to the routing table using ip route do not persist across system reboots. To permanently configure static routes, you can configure them by creating a route- interface file in the /etc/sysconfig/network-scripts/ directory for the interface. For example, static routes for the enp1s0 interface would be stored in the /etc/sysconfig/network-scripts/route- enp1s0 file. Any changes that you make to a route- interface file do not take effect until you restart either the network service or the interface. The route- interface file has two formats: ip command arguments, see the section called "Static Routes Using the IP Command Arguments Format" . and network/netmask directives, see the section called "Static Routes Using the Network/Netmask Directives Format" . See the ip-route(8) man page for more information on the ip route command.
~]USD ip route default via 192.168.122.1 dev ens9 proto static metric 1024 192.168.122.0/24 dev ens9 proto kernel scope link src 192.168.122.107 192.168.122.0/24 dev enp1s0 proto kernel scope link src 192.168.122.126 ~]# ip route add 192.0.2.1 via 10.0.0.1 [ dev interface ] ~]# ip route add 192.0.2.0/24 via 10.0.0.1 [ dev interface ] ~]# ip route del 192.0.2.1