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linux: added wi-fi and troubleshooting

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wiki/linux/networkmanager.md
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NetworkManager - short NM - is a program to automatically detect and connect to
networks by providing options for various configuration.
It is used to set up [Wi-Fi](/wiki/linux/wi-fi.md).
## Setup
@ -26,3 +27,18 @@ This plugin can be installed with the `networkmanager-openvpn` package.
OpenVPNs `.ovpn` files can then be imported by running
`nmcli connection import type openvpn file <openvpn-file>`.
Afterwards they can be modified accordingly.
## Troubleshooting
This section focusses on the troubleshooting of situations where the system does not connect
correctly.
### Restarting and Reenabling Wi-Fi
A useful chain of commands is the following.
It will restart the [SystemD](/wiki/linux/systemd.md) service and enable the Wi-Fi device.
```sh
systemctl restart NetworkManager
nmcli radio wifi on
```

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wiki/linux/wi-fi.md Normal file
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# Wi-Fi
Wi-Fi is a type of wireless network protocol that is used for local area networks.
On [Linux-based systems](/wiki/linux.md) there are different programs that handle the Wi-Fi
connection.
- [WPA Supplicant](/wiki/linux/wpa_supplicant.md) is used for WPA2 and WPA3 connections among
others.
- [NetworkManager](/wiki/linux/networkmanager.md) is used for various network connections.
## Usage
Tipps for usage can be found under the corresponding entries.
## Troubleshooting
Tipps for troubleshooting can be found under the corresponding entries, but the ones that use
multiple programs to fix are listed here.
### Restart WPA Supplicant and Reenable the Wi-Fi device
A simple fix for many problems is a restart of [WPA Supplicant](/wiki/linux/wpa_supplicant.md)
aswell as reenabling the Wi-Fi device using [NetworkManager](/wiki/linux/networkmanager.md).
This can be done by first restarting WPA Supplicant as explained in the
[corresponding section](/wiki/linux/wpa_supplicant.md#restarting-wpa-supplicant) and then
reenabling the Wi-Fi device as explained in the
[section of NetworkManagers entry](/wiki/linux/networkmanager.md#restarting-and-reenabling-wi-fi).

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wiki/linux/wpa_supplicant.md
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`wpa_supplicant` is a free implementation of an IEEE 802.11i supplicant.
It is especially interesting due to its WPA2 and WPA3 capabilities in contrast
to other networking software.
It is used to set up [Wi-Fi](/wiki/linux/wi-fi.md).
## Usage
@ -17,3 +18,17 @@ This part assumes that your network interface is called `wlan0`
- Connect to the WLAN by running
`wpa_supplicant -B -D wext -i wlan0 -c /etc/wpa_supplicant.conf`
(`-B` is optional for running the process in the background)
## Troubleshooting
This section focusses on the troubleshooting of situations where the system does not connect
correctly.
### Restarting WPA Supplicant
Most of the problems regarding WPA Supplicant can be fixed by restarting the
[SystemD](/wiki/linux/systemd.md) service with the following command.
```sh
systemctl restart wpa_supplicant
```