How to remove fixed IP in RHEL

To remove a fixed IP address in Red Hat 8, you need to edit network configuration files or use nmcli (NetworkManager Command Line Interface)

WARNING! Be careful when restarting the networking service over an SSH session. !!!

The old way (Editing Network Configuration Files)

• Open the network configuration file for the interface (e.g., ifcfg-enp0s3):

sudo nano /etc/sysconfig/network-scripts/ifcfg-<interface-name>

• Remove or update the following lines to switch to DHCP:

BOOTPROTO=dhcp

• Remove any IPADDR, PREFIX, NETMASK, or GATEWAY entries. / or comment on it.
• Restart the network service

sudo systemctl restart NetworkManager

Using nmcli

• check connection name

nmcli connection show

• Modify the connection to remove the fixed IP
  Note: Replace "connection-name" with the name of the connection from previous command

nmcli connection modify "your-connection-name" ipv4.addresses "" ipv4.method auto

• Restart the network connection

nmcli connection up "your-connection-name"