linux 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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echo "any net 110.188.40.0/24 gw 110.188.40.1" >> /etc/sysconfig/static-routes

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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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# 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 some params of existing route
ip route change 192.192.13.1/24 dev ens32