Question 1

How to set up a static IP address with NetworkManager?

Accepted Answer

Use the nmcli command, e.g., 'nmcli con mod eth0 ipv4.addresses 192.168.1.10/24 ipv4.gateway 192.168.1.1 ipv4.method manual'. Alternatively, edit connections interactively with nmtui or GUI tools like nm-connection-editor.

Question 2

NetworkManager vs systemd-networkd: which is better for Linux servers?

Accepted Answer

NetworkManager is ideal for dynamic environments like desktops or laptops with frequent network changes, thanks to its automation. systemd-networkd is lighter and better suited for static server setups with minimal overhead. Choose based on your need for automation versus simplicity.

Question 3

Why won't NetworkManager connect to my Wi-Fi network?

Accepted Answer

Common causes include driver issues, as NetworkManager only supports upstream kernel drivers. Check debug logs with 'journalctl -u NetworkManager', ensure wpa_supplicant is running, and verify that the network profile is correctly configured in settings services.

Question 4

How to disable NetworkManager and use netplan on Ubuntu?

Accepted Answer

Stop and disable the NetworkManager service with 'sudo systemctl stop NetworkManager' and 'sudo systemctl disable NetworkManager'. Then, configure YAML files in /etc/netplan/ and apply changes with 'sudo netplan apply', as netplan handles network configuration independently.

Question 5

What's the best way to manage VPN connections with NetworkManager?

Accepted Answer

NetworkManager supports various VPN types through plugins; use nmcli or GUI tools to add VPN configurations. Ensure the relevant VPN plugin (e.g., for OpenVPN or WireGuard) is installed, and profiles are stored in settings services for persistent management.

Question 6

How to troubleshoot NetworkManager connection drops on a laptop?

Accepted Answer

Enable debug logging in NetworkManager.conf, monitor logs with 'journalctl -f -u NetworkManager', and check for hardware issues like killswitches. Use nmcli to list connections and restart services if needed, focusing on driver and external daemon interactions.

Question 7

Is NetworkManager necessary for a headless Linux server?

Accepted Answer

Not always; for servers with static IPs and no dynamic network needs, manual configuration or lighter tools like systemd-networkd may suffice. NetworkManager is beneficial if you require automation, mobile broadband, or integration with desktop-like services.

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