linux route
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network shown in the “Permanent” and “replace route” sections are the legacy RHEL/CentOS 7 inet-scripts approach — superseded by NetworkManager (nmcli / /etc/NetworkManager/system-connections/) on RHEL 8+ and modern distros.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
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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
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- 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
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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
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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
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change route
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| # change some params of existing route
ip route change 192.192.13.1/24 dev ens32
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