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Configuring a Network (RHEL-10)

Steps to configure a network in Linux through NetworkManager
What does configuring a network mean?
  • To set up an IP address (automatic or manaul).
  • Connecting to a Wifi or wired network.
  • Setting DNS (Domain Name Server).
  • Managing network interfaces (like eth0 and enp0s3).


To configure a network through NetworkManager we use two methods. They are Nmcli and Nmtui.

Nmcli:

  • Nmcli (NetworkManager Command Line Interface) is used to create IP addresses automatically or manually. It is command-based.
  • We use Linux to control your network from the terminal.
  • We use nmcli to also check the status of the network. We type the command "nmcli connection show" in the terminal. (Pic 1)
  • We can switch which particular network we want to connect to. The command for that is nmcli connection up <connection_name>
  • We can enable/disable network interfaces.
  • The two methods to assign IP address to Network interface card is Dynamic (Automatic) and Static (Manual).

Automatic method:

  • In this method we add a connection by writing the following command:

nmcli connection add con-name "network-name" type ethernet autoconnect yes ifname enp0s3 ipv4.method auto

- You can add the required network name you want to create. You can also add which different network interface card you want to add in your network.

Manual method:

  • In this method we add a connection by writing the following command:

nmcli connection add con-name "network-name" type ethernet ifname enp0s3 autoconnect yes ipv4.addresses "192.168.100.100/24" ipv4.method manual

  • We can also add the Dns server, gateway and IP address manually.

nmcli connection add con-name "dell" type ethernet autoconnect yes ifname enp0s3 ipv4.addresses "10.0.1.10/8" ipv4.gateway "10.0.1.1" ipv4.dns "10.0.1.1" ipv4.method manual

  • To watch the details of these connections we use the command:

nmcli connection show "dell" | grep -i "ipv4"

Deleting a connection:

nmcli connection delete "dell"

To watch active connections:

nmcli connection show --active

To collect the information from the connections:

ip: ifconfig, ip -br -c a

dns: cat /etc/resolv.conf

gateway: ip route


Nmtui:
  • It is a text based user interface.
  • NetworkManager Text User Interface is a graphical terminal-based menu used for configuring networks.
  • It is more user friendly compared to nmcli.
  • We don't need to memorise the commands in nmtui. We just have to enter the required details.
  • We go to the menu by typing nmtui.
  • We have to edit the connection and then active it.
  • We then set the hostname for the system
  • We set the IP address and other required details.

Steps:

  1. Type Nmtui and a menu will appear.
  2. Choose the option 'Edit connection'.
  3. Select the connection you want to edit. Eg: enp0s3




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