User vermaden demonstrates how to set up a highly available DHCP server on FreeBSD. This setup in particular utilizes ISC (Internet Systems Consortium) DHCP server available in ports. See the link below for the full set of instructions

Today I would like to share a highly available DHCP server setup on FreeBSD system, but it should be similarly simple on other UNIX and Unix-like systems. I will use the most obvious choice here – the Internet Systems Consortium implementation – ISC DHCP server – available in the FreeBSD Ports and packages as well.

The setup of each DHCP server node is very simple. Its FreeBSD 11.2-RELEASE installed on a 4 GB GPT partition using UFS for the / filesystem and only 666 MB are used as shown below….

Full tutorial:

Highly Available DHCP Server on FreeBSD