Hello John,

We are pleased to inform you that we've addressed your issue in our next releases of ISC DHCP: 4.3.6 (July 2017), 4.1-ESV-R15 (July 2017) and 4.4.0 (around Q4'17).

We have added a new command line option for the dhclient, --dad-wait-time, which allows you to specify a maximum time that the dhclient process should wait for the duplicate address detection to complete before initiating any DHCP transactions. The actual wait is performed in a dhclient-script, so you have to make sure that the script you're using supports this new parameter. The good news is that we have updated dhclient-scripts that we're shipping with ISC DHCP and you can use them as reference in case you're using some custom script.

We like to give our contributors credit for their submissions by citing them in the release notes. If you would like to be recognized in this manner, please respond with how you wish to be identified. Typically	it is by name and/or organization.

Thank you for interest and for taking the time and effort to report the issue. We welcome any future submissions you choose to make.

Sincerely,

Marcin Siodelski
ISC Software Engineering