Ubuntu uses the NetworkManager daemon for managing network configuration. In this guide, you will learn how to configure a static IP address on Ubuntu 20.04 server and desktop. For this reason, you may want to set a static IP address so that it never changes even when the lease time is up. The drawback with DHCP is that once the DHCP lease time has lapsed, the IP address of a system changes to a different one, and this leads to a disconnection in case the system was used for a particular service such as a file server. This is made possible through the DHCP server which auto-assigns IP addresses to clients from a pool of addresses.
Usually, when a client system connects to a network via WiFi or an ethernet cable, it automatically picks an IP address from the router.
