Thanks. Later found this also https://gtacknowledge.extremenetworks.com/articles/How_To/How-to-delete-the-DHCP-lease-file-on-the-I... basically it is possible to go to the shell level and edit the leases file. I would add to the How To that the default writing cycle of the dhcp daemon to this lease file is 5 minutes, and it is best to start editing after the next write is done so one gets full 5 minutes editing time.