ISC's Dynamic Host Configuration Protocol Distribution provides a freely redistributable reference implementation of all aspects of the DHCP protocol, through a suite of DHCP tools:
- A DHCP server
- A DHCP client
- A DHCP relay agent
These tools all use a modular API which is designed to be sufficiently general that it can easily be made to work on POSIX-compliant operating systems and also non-POSIX systems like Windows NT and MacOS.
The DHCP server, client and relay agent are provided both as reference implementations of the protocol and as working, fully-featured sample implementations. Both the client and the server provide functionality that, while not strictly required by the protocol, is very useful in practice. The DHCP server also makes allowances for non-compliant clients which one might still like to support.