It is open-source software that implements the Dynamic Host Configuration.
Edit By BS Editor: ISC DHCP is open-source software that implements the Dynamic Host Configuration Protocols for connection to a local network. It is a reference implementation of those protocols, but it is also production-grade software, suitable for use in high-volume and high-reliability applications.

DHCP is an Internet-standard protocol by which a computer can be connected to a local network, ask to be given configuration information, and receive from a server enough information to configure itself as a member of that network.

* What is ISC DHCP and what does it do?
* How to get ISC DHCP? Visit our downloads page
* Documentation, mailing lists and external links, and FAQ
* New features and capabilities in recent versions of ISC DHCP
* Security advisories, known vulnerabilities and upgrade recommendations
* History of ISC DHCP
* ISCs DHCP-related professional services including support contracts and training

ISC developed and maintains ISC DHCP, and actively supports versions 3.1 and 4.0. Earlier versions, though not actively supported, are still available in our archives.

ISC DHCP 4.1.x will have several new DHCPv6 features that were not in DHCP 4.0.x. These are planned to include:

* Support for the rapid-commit option on the client side
* Prefix Delegation support
* IA_TA address support
* A basic DHCPv6 relay agent, dhcrelay6

There are a number of DHCPv6 limitations and features missing in this release, which will be addressed in the future:

* Only Solaris, Linux, FreeBSD, NetBSD, and OpenBSD are supported.
* Only a single address is supported per IA.
* DHCPv6 includes human-Readable text in status code messages. These should be configurable, and probably localized via gettext() or the like.
* The host-identifier option is limited to a simple token.
* The client and server can only operate DHCPv4 or DHCPv6 at a time, not both. you can free download ISC DHCP 4.2.0a2 now.