Linux ip Command Cheat Sheet
Adding a default route
ip route add default via <gateway ip>
Optionally with an interface
ip route add default via <gateway ip> dev <interface>
Adding a subnet route to an interface
ip route add <ip>/<mask> dev <interface>
Deleting a route
ip route del default
ip route del <ip addr>/<mask>
Checking a route
ip route get 8.8.8.8
Adding a static IP to an interface
ip addr add <ip addr>/<mask> broadcast <broadcast addr> dev <interface>
Removing a static IP from an interface
ip addr del <ip addr>/<mask> dev <interface>
Setting interfaces up/down
ip link set dev <interface> up
ip link set dev <interface> down