Linux Networking Commands

Linux Networking Commands

In this memo, I’m showing Linux networking commands to remember as a network engineer/technician.

To show the IP address assigned to an interface:

ip address show

To assign an IP Address to an interface, for example, ens33:

ip address add 192.168.8.20/24 dev ens33

To delete an IP Address on an interface:

ip address del 192.168.8.20/24 dev ens33

To online or up an interface, for example, eth0:

ip link set eth0 up

To offline or down an interface:

ip link set eth0 down

To change an interface MTU, the default MTU is 1500:

ip link set eth0 mtu 9000

To add a default route:

ip route add default via 192.168.1.254 dev eth0

To add a route to 192.168.1.0/24 via the gateway at 192.168.1.254:

ip route add 192.168.1.0/24 via 192.168.1.254

Add a route to 192.168.1.0/24 that can be reached on the device:

ip route add 192.168.1.0/24 dev ens33

Delete the route for 192.168.1.0/24 via the gateway at 192.168.1.254:

ip route delete 192.168.1.0/24 via 192.168.1.254