4.4. Configuring Static Routes with ip commands
As a system administrator, you can configure static routes using the
To display the
IProuting table, use the
ip routecommand. 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 enp1s0 proto kernel scope link src 192.168.122.126
ip routecommands take the following form:
ip route [ add | del | change | append | replace ] destination-addressSee 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 [
where 192.0.2.1 is the
IPaddress 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
IPaddress representing a range of
~]#where 192.0.2.0 is the
ip route add192.0.2.0/24 via 10.0.0.1 [
IPaddress 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 del192.0.2.1
Any changes that you make to the routing table using
ip routedo not persist across system reboots. To permanently configure static routes, you can configure them by creating a
route-interfacefile 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-enp1s0file. Any changes that you make to a
route-interfacefile do not take effect until you restart either the network service or the interface. The
route-interfacefile 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”.
ip-route(8)man page for more information on the