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:

.. code-block:: bash

    sudo ip addr add 192.168.0.2/16 dev eno1

Machine2:

.. code-block:: bash

    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

.. code-block:: bash

    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:

.. code-block:: bash

    ping -I eno1 192.168.0.3

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

.. code-block:: bash

    ip route

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

.. code-block:: bash

  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:

.. code-block:: bash

    sudo ip addr flush eth0