# Network Debugging
You can set `systemd-networkd` to work in debug mode so that you can analyze log files with debugging information to help troubleshoot networking problems.
The following procedure turns on network debugging by adding a drop-in file in `/etc/systemd` to customize the default systemd configuration in `/usr/lib/systemd`.
1. Run the following command as root to create a directory with this exact name, including the `.d` extension:
`mkdir -p /etc/systemd/system/systemd-networkd.service.d/`
1. Run the following command as root to establish a systemd drop-in unit with a debugging configuration for the network service:
```
cat > /etc/systemd/system/systemd-networkd.service.d/10-loglevel-debug.conf << "EOF"
[Service]
Environment=SYSTEMD_LOG_LEVEL=debug
EOF
```
1. Reload the `systemctl` daemon and restart the `systemd-networkd` service for the changes to take effect:
```
systemctl daemon-reload
systemctl restart systemd-networkd
```
1. Verify that your changes took effect:
`systemd-delta --type=extended`
1. View the log files by running this command:
`journalctl -u systemd-networkd`
1. After debugging the network connections, turn debugging off by deleting the drop-in file:
`rm /etc/systemd/system/systemd-networkd.service.d/10-loglevel-debug.conf`