{"id":2286,"date":"2023-10-07T14:49:19","date_gmt":"2022-09-28T18:42:39","guid":{"rendered":""},"modified":"2025-02-02T00:46:18","modified_gmt":"2025-02-01T23:46:18","slug":"configure-networking-on-almalinux-8-centos-8-or-rocky-linux-8-with-nmcli-command","status":"publish","type":"post","link":"https:\/\/netcloud24.com\/knowledgebase\/configure-networking-on-almalinux-8-centos-8-or-rocky-linux-8-with-nmcli-command\/","title":{"rendered":"Configure Networking on AlmaLinux 8, CentOS 8, or Rocky Linux 8 with nmcli Command"},"content":{"rendered":"

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Configuring network settings is an essential task when managing servers. The nmcli<\/code> command-line tool provides a straightforward way to manage NetworkManager from the terminal. In this guide, we will walk you through 20 examples of configuring networking on AlmaLinux 8, CentOS 8, or Rocky Linux 8 using the nmcli<\/code> command. Whether you are deploying it on a local server or using a , this tutorial covers all the necessary steps.<\/p>\n

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Step 1: Check Network Status<\/h2>\n

To check the status of your network interfaces, use the following command:<\/p>\n

nmcli device status<\/code><\/pre>\n<\/section>\n
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Step 2: List Available Network Connections<\/h2>\n
To list all available network connections, run:<\/p>\n
nmcli connection show<\/code><\/pre>\n<\/section>\n
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Step 3: Create a New Connection<\/h2>\n
To create a new connection, use:<\/p>\n
nmcli connection add type ethernet con-name my-connection ifname eth0<\/code><\/pre>\n<\/section>\n
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Step 4: Set a Static IP Address<\/h2>\n
To set a static IP address, use:<\/p>\n
\r\nnmcli connection modify my-connection ipv4.addresses 192.168.1.100\/24\r\nnmcli connection modify my-connection ipv4.gateway 192.168.1.1\r\nnmcli connection modify my-connection ipv4.dns 8.8.8.8\r\nnmcli connection modify my-connection ipv4.method manual\r\n            <\/code><\/pre>\n<\/section>\n
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Step 5: Enable the Connection<\/h2>\n
To enable the newly created connection, run:<\/p>\n
nmcli connection up my-connection<\/code><\/pre>\n<\/section>\n
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Step 6: Set Up DHCP<\/h2>\n
To set up DHCP for an existing connection, use:<\/p>\n
nmcli connection modify my-connection ipv4.method auto<\/code><\/pre>\n<\/section>\n
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Step 7: View Current IP Address<\/h2>\n
To view the current IP address assigned to your interface, use:<\/p>\n
nmcli -p device show eth0<\/code><\/pre>\n<\/section>\n
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Step 8: Delete a Connection<\/h2>\n
To delete a specific connection, run:<\/p>\n
nmcli connection delete my-connection<\/code><\/pre>\n<\/section>\n
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Step 9: Modify a Connection<\/h2>\n
To modify an existing connection, use:<\/p>\n
nmcli connection modify my-connection ipv4.addresses 192.168.1.101\/24<\/code><\/pre>\n<\/section>\n
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Step 10: Set Connection to Auto-Connect<\/h2>\n
To make a connection auto-connect at boot, use:<\/p>\n
nmcli connection modify my-connection connection.autoconnect yes<\/code><\/pre>\n<\/section>\n
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Step 11: Disable a Connection<\/h2>\n
To disable a connection, run:<\/p>\n
nmcli connection down my-connection<\/code><\/pre>\n<\/section>\n
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Step 12: Restart NetworkManager<\/h2>\n
If you need to restart NetworkManager, use:<\/p>\n
sudo systemctl restart NetworkManager<\/code><\/pre>\n<\/section>\n
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Step 13: View Connection Details<\/h2>\n
To view detailed information about a connection, use:<\/p>\n
nmcli connection show my-connection<\/code><\/pre>\n<\/section>\n
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Step 14: Configure VLANs<\/h2>\n
To create a VLAN connection, run:<\/p>\n
\r\nnmcli connection add type vlan con-name my-vlan ifname eth0 id 10\r\n            <\/code><\/pre>\n<\/section>\n
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Step 15: Set up Bridge Connection<\/h2>\n
To create a bridge connection, use:<\/p>\n
nmcli connection add type bridge con-name my-bridge ifname br0\r\nnmcli connection add type ethernet con-name my-bridge-slave ifname eth0 master br0\r\n            <\/code><\/pre>\n<\/section>\n
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Step 16: Monitor Network Activity<\/h2>\n
To monitor network activity, use:<\/p>\n
nmcli monitor<\/code><\/pre>\n<\/section>\n
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Step 17: Set MTU<\/h2>\n
To set the MTU (Maximum Transmission Unit) for a connection, use:<\/p>\n
nmcli connection modify my-connection 802-3-ethernet.mtu 1500<\/code><\/pre>\n<\/section>\n
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Step 18: Set IPv6 Configuration<\/h2>\n
To enable IPv6 and set its configuration, run:<\/p>\n
\r\nnmcli connection modify my-connection ipv6.method auto\r\n            <\/code><\/pre>\n<\/section>\n
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Step 19: Backup Connection Configuration<\/h2>\n
To backup your connection configuration, copy the configuration file:<\/p>\n
nmcli connection export my-connection > my-connection.backup<\/code><\/pre>\n<\/section>\n
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Step 20: Restore Connection Configuration<\/h2>\n
To restore a connection configuration from a backup, run:<\/p>\n
nmcli connection import my-connection.backup<\/code><\/pre>\n<\/section>\n