Hello Xavier: Thank you for your submission. This is an interesting addition to the configuration syntax. We will take into consideration for our next release, 4.4.2, though its release date has yet to be determined. We will let you know whether or not we decide to include your changes. As you may know, 4.4.1 was the last feature release for ISC DHCP. While we will continue to do maintenance releases for some time to come, most of our DHCP resources are focused on our new DHCP project, Kea: https://gitlab.isc.org/isc-projects/kea/wikis/home Again, thank you for taking the time to create the patch and submit it to us. User involvement has always been a huge part of ISC's efforts and we appreciate all of them. Regards, Thomas Markwalder ISC Software Engineering