Hello Indy:

You'll be pleased to learn that we have added a command line argument, --prefix-len-hint, to dhclient that instructs the client to use the specified value as the prefix length hint when soliciting prefixes. This change will be available in our upcoming feature release, 4.4.0, due out first quarter 2018.

We like to thank our contributors by citing them in the release notes.  If you care to recognized in this manner, please respond with how you want to be identified.  Typically it is by name and/or organization.

Thank you for suggesting this change.

Regards,

Thomas Markwalder
ISC Software Engineering