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Hello David:

You'll be pleased to hear that we've addressed this issue in our upcoming releases: 4.3.5 and 4.1-ESV-R14 due out this fall. We added a global parameter, "abandon-lease-time", which is used as the length of time an abandoned lease remains in the abandoned state.  The default is 86400 seconds.  The server will not attempt to reclaim an abandoned lease before then unless there are no free addresses. In which case, the server will conduct a ping check (provided they are enabled) prior to offering an abandoned lease.  Note that the expiry period is preserved across system restarts so abandoned leases.  Hopefully this addresses your issues.

Attached to this email is a patch containing the changes if you wish to test them. We would greatly appreciate your feedback.  

Lastly, it is our custom to thank our contributors by citing them in the release notes.  If you would like be recognized in this fashion please reply with how you would like to be identified.  Most often, it is by name and/or organization.

Thank you for bringing this matter to our attention and for the time and effort you have spent on it.  We welcome any future submissions you care to make.

Sincerely,

Thomas Markwalder
ISC Software Engineering