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NetworkManager is an essential tool for managing network connections on AlmaLinux 9. It simplifies the process of configuring, maintaining, and troubleshooting network connections. In this guide, we will walk you through how to install NetworkManager, manage it (start, restart, and stop), troubleshoot common issues, and provide essential commands to ensure that your network is running smoothly.

How to Install NetworkManager in AlmaLinux 9

If NetworkManager is not installed on your AlmaLinux 9 system, follow the steps below to install it.

Step 1: Check if NetworkManager is Installed

To check if NetworkManager is already installed, run the following command:

sudo dnf list installed | grep NetworkManager

Step 2: Install NetworkManager

If it is not installed, use the following command to install NetworkManager:

sudo dnf install NetworkManager

Managing NetworkManager

Starting NetworkManager

To start NetworkManager and ensure that it runs automatically at boot, use the following commands:

sudo systemctl start NetworkManager

sudo systemctl enable NetworkManager

Restarting NetworkManager

If you need to restart the service to apply new network configurations, run the following command:

sudo systemctl restart NetworkManager

Stopping NetworkManager

To stop NetworkManager, use this command:

sudo systemctl stop NetworkManager

Checking NetworkManager Status

To check the current status of NetworkManager, use the following command:

sudo systemctl status NetworkManager

NetworkManager Troubleshooting

If you encounter network issues, NetworkManager has built-in tools to help you troubleshoot.

Step 1: Check Network Interface Status

Verify the status of your network interfaces by running the following command:

ip a

If the interface is down, bring it up with:

sudo ip link set dev [interface] up

Step 2: Restart Networking Services

If your network is still not functioning properly, try restarting the network services:

sudo systemctl restart NetworkManager

Step 3: Verify NetworkManager Connectivity

You can also test network connectivity with a ping test:

ping 8.8.8.8

Additional Useful Commands

Enable ICMP (Ping) in Firewall

If your server blocks ping requests, enable it by running:

sudo firewall-cmd --permanent --add-icmp-block-inversion

sudo firewall-cmd --reload

Check Active Network Connections

To view the currently active network connections, run:

nmcli connection show

Restarting a Specific Network Connection

To restart a specific network connection, use the following command:

nmcli connection up [connection-name]

List Available Network Devices

To list all network devices, run:

nmcli device status

Benefits of Using NetworkManager in AlmaLinux 9

NetworkManager offers several advantages for managing network connections on AlmaLinux 9:

  • It simplifies the management of network interfaces, making it easier for users to configure and control networking settings.
  • It supports automatic detection and configuration of network interfaces, reducing the need for manual intervention.
  • NetworkManager can manage multiple connections and automatically switch between them, ensuring continuous connectivity.
  • It offers tools for troubleshooting and monitoring network issues, helping users maintain a stable network environment.

By following the steps and commands outlined in this guide, you should be able to efficiently install, manage, and troubleshoot NetworkManager in AlmaLinux 9, ensuring a seamless networking experience.

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