The odikadhcpd server is an open source dhcp server that works behind a relay dhcp. It couldn't be installed in front of a dhcp client. It is designed to respond to Telco providers or enterprises needs, which want a centralized dhcp server solution.
* hooks for pre-process and post-process dhcp request
* modular solution with referential in file,ldap,mysql and lease in mysql
* support customize referentiel and lease solution
* support integration of lease database with powerdns backend...