Post History

## Begin with the logs

I'd begin with the logs: `journalctl -u NetworkManager`

You may want to create a log config file for this:

`vim /etc/NetworkManager/conf.d/95-nm-debug.conf` # perhaps sudo, to have access to /etc

File contents:

```
[logging]
domains=ALL:TRACE
```

`systemctl restart NetworkManager` to make NM notice the changes.

### Logs incomplete?

If logging output is incomplete, disable rate limiting in the journal:

1. `vim /etc/systemd/journald.conf`
2. find `RateLimitBurst`
3. set to `0`
4. `systemctl restart systemd-journald`

## Python helper scripts

I hear there are some, but haven't used them.

`sudo /usr/lib/NetworkManager/debug-helper.py --nm debug # or info or trace if not debug`

## Testcase for debugging

This stops NM, unloads and loads the DRIVER, then starts NM again. Should provide good logs.
```
sudo service network-manager stop
sudo modprobe -r DRIVER
sudo modprobe DRIVER
sudo service network-manager start
```

## Sources 

For more, see:

1. https://wiki.ubuntu.com/DebuggingNetworkManager
2. https://wiki.gnome.org/Projects/NetworkManager/Debugging
3. https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/configuring_and_managing_networking/introduction-to-networkmanager-debugging_configuring-and-managing-networking