Linux network setup

Show network devices:

ip addr

More details about a specific network adapter:

ethtool enp0s3

About network names: en → ethernet (could be wl → wireless), p0 → bus PCI-0 (could be u → USB), s3 → slot 3.

Check if NetworkManager is running in your system:

sudo systemctl status NetworkManager

If it is not active, start NetworkManager:

sudo systemctl start NetworkManager

If NetworkManager is not installed in your system:

sudo dnf install NetworkManager
sudo apt install network-manager

Check the device status:

nmcli device

Network setting files in Centos: /ect/sysconfig/network-scripts. Network setting files in Ubuntu: /ect/NetworkManager/NetworkManager.conf.

If you make any changes, you need to restart the NetworkManager service to take effect.

Details about a network connection:

nmcli connection show Wired\ Connection\ 1

If there is no connection name for a network device, you can try the device name instead.

Edit a connection profile:

nmcli connection edit Wired\ Connection\ 1

Print details about a specific section:

nmcli> print ipv4

Make changes:

nmcli> set ipv4.method auto
nmcli> save
nmcli> quit

We can restart the connection to reflect the changes:

nmcli connection down Wired\ Connection\ 1
nmcli connection up Wired\ Connection\ 1