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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:
~]$ 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 eth0 proto kernel scope link src 192.168.122.126
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:
~]#ip route add192.0.2.1 via 10.0.0.1 [devinterface]
where 192.0.2.1 is the
IP address of the host in dotted decimal notation, 10.0.0.1 is the next hop address and interface is the exit interface leading to the next 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 theip route add192.0.2.0/24 via 10.0.0.1 [devinterface]
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:
~]# ip route del 192.0.2.1
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 eth0 interface would be stored in the /etc/sysconfig/network-scripts/route-eth0 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.
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