I've configured my dhcp server so it can successfully add records to a private DNS zone when it issues a lease for a client.

I never see it removing a lease however.

Is it supposed to do so or is there some configuration param I should be setting to get this behaviour?

I'm using the 'interim' style of dynamic DNS updates.

  • 1
    To my knowledge ISC dhcpd is supposed to clean up DNS entries for expired leases based on the data stored with the lease. Feb 1, 2021 at 21:31
  • Indeed it cleans the records in the standaed update scheme. See this link: kb.isc.org/docs/aa-01091
    – drookie
    Feb 3, 2021 at 6:31
  • I believe you, but for my own satisfaction I'll have to check the logs more carefully to see if it does remove them. Thx for mentioning the 'standard' method. I must have followed an older guide and was using 'interim'. I've cleaned up my leases and zone files and converted to standard.
    – pnadeau
    Feb 4, 2021 at 23:00


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