Setup DHCP server on Raspberry Pi

In a network, a DHCP server manages the IP addresses and distributes the IP configuration. An IPv4 configuration includes one IPv4 address, the subnet mask, and the default gateway and DNS server IPv4 addresses. This configuration is communicated to the requesting host along with the lease time from the DHCP server. The lease time indicates how long the IP configuration is valid and can be used.

setup Raspberry Pi ISC DHCP server

There are several DHCP servers for Linux. The DHCP server of ISC is the most common and powerful DHCP server. At the same time, it is comparatively easy to configure.
Preparing to operate a DHCP server