Static IP over ethernet

This is a quick reference for the commands for setting a static ip on two computers connected via ethernet so that they can communicate.

First we need to add an ip to both machines. You need to know the name of your ethernet interface, you can use a command line ifconfig; here we use eno1 as the ethernet interface name. Note that both machine need to use the same network (same netid and netmask).

Machine1:

sudo ip addr add 192.168.0.2/16 dev eno1

Machine2:

sudo ip addr add 192.168.0.3/16 dev eno1

If you run ifconfig you should see the ip address assigned to the ethernet interface.

Next we create a route from Machine 1 to Machine 2

sudo ip route add 192.168.0.3 dev eno1

And do the opposite for Machine 2.

We can test the connection via a ping to Machine 2:

ping -I eno1 192.168.0.3

That’s it. You can see a list of the configured routes with:

ip route

Here is an example on how to use scp to copy files over ssh:

scp machine1@localhost:/some/path/ machine2@192.168.0.3:/your/path/

You can delete routes and addresses via ip addr del and ip route del.

To flush all settings of an interface:

sudo ip addr flush eth0