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Networking.md

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Networking

Objectives :-

  • Getiing familiar with nmcli command to configure network settings.
  • Modifying network configuration using /etc/sysconfig/network-scripts/ifcfg-name.

Network manager concepts

commands and graphical tools contacts to NetworkManager and saves configuration file in /etc/sysconfig/network-scripts directiry.

listing networking information.

nmcli dev status command shows the status of network devices.

[root@localhost ~]# nmcli dev status

DEVICE  TYPE      STATE         CONNECTION 
enp0s3  ethernet connected      enp0s3
virbr0  bridge  connected       virbr0

nmcli con show shows list of all connections

[root@localhost ~]# nmcli con show

Controllng network connections

The nmcli con up NAME command activates the connection name on the network interface.

[root@localhost ~]# nmcli con up enp0s3

The nmcli con down NAME command deactivates the connection name on the network interface.

[root@localhost ~]# nmcli con down enp0s3

Deleting a network connections

The nmcli con del NAME commmand deletes the connection.

[root@localhost ~]# nmcli con del enp0s3

Connection configuration files

changes made with nmcli con mod name saved to /etc/sysconfig/network-scripts/ifcfg-name.

Modifying network configuration

It is easy to configure the network by directly editing the connection configuration files. these files are named /etc/sysconfig/network-scripts/ifcfg-name. note - after modifying network configuration file run following commands to make NetworkManager read the configuration changes.

[root@localhost ~]# nmcli con reload
[root@localhost ~]# nmcli con down enp0s3
[root@localhost ~]# nmcli con up enp0s3