Note: The ephemeral ip route add/del/replace/change commands below are still current standard tooling. However, the permanent-config files (/etc/sysconfig/static-routes, /sbin/ifup-local) and service network / systemctl restart network shown in the "Permanent" and "replace route" sections are the legacy RHEL/CentOS 7 inet-scripts approach — superseded by NetworkManager (nmcli / /etc/NetworkManager/system-connections/) on RHEL 8+ and modern distros. The route command is also a legacy alias; use ip route instead.
add static route
add default static route
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# Permanent echo"any net 0.0.0.0/0 gw 110.188.40.1" >> /etc/sysconfig/static-routes # Temporary ip route add default dev vlan7 ip route add default via 110.188.40.1 ip route add default via 110.188.40.1 dev vlan7 ip route add 0.0.0.0/0 dev vlan7 ip route add 0.0.0.0/0 via 110.188.40.1 ip route add 0.0.0.0/0 via 110.188.40.1 dev vlan7
add specific net static route
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echo"any net 110.188.40.0/24 gw 110.188.40.1" >> /etc/sysconfig/static-routes
delete route
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# delete default route route del default gw 110.188.40.1 ip route del default via 110.188.18.1 dev vlan16 # delete a non-default route ip route del 110.188.18.0/24 via 110.188.18.1 dev vlan16
replace route
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# work well after every network restart # replace if exists, or add echo"ip route replace default via 110.188.40.1 dev vlan7" >> /sbin/ifup-local chmod +x /sbin/ifup-local systemctl restart network
change route
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# change some params of existing route ip route change 192.192.13.1/24 dev ens32