# Classroom networking

Ethernet remains the normal classroom connection. The package also installs
and enables NetworkManager so an administrator can add Wi-Fi when a room needs
it; there is no classroom Wi-Fi screen and no network name or password in the
package.

## Add Wi-Fi

From a terminal or SSH session, run:

```
sudo nmtui
```

Choose **Activate a connection**, select the church Wi-Fi network, enter its
password, and activate it. NetworkManager saves the connection as a system
connection and reconnects it automatically after reboot.

Useful checks:

```
nmcli device status
nmcli connection show
systemctl status NetworkManager
```

There is nothing to configure on a computer without Wi-Fi hardware.
NetworkManager starts normally, sees no Wi-Fi device, and Ethernet continues
to work.

## Existing Ethernet configuration

Do not remove or rewrite `/etc/network/interfaces` as part of this procedure.
Debian Trixie's NetworkManager configuration uses the `ifupdown` plugin with
`managed=false`, so any Ethernet interface declared there remains under
ifupdown's control. NetworkManager manages other interfaces, including Wi-Fi.
This preserves an existing static or ifupdown Ethernet setup.

The package disables `NetworkManager-wait-online.service`; no classroom
feature is allowed to hold boot waiting for Wi-Fi or Internet access. Saved
connections still reconnect automatically.