When does ISC dhcpd expire leases

Posted by Joachim Breitner on Server Fault See other posts from Server Fault or by Joachim Breitner
Published on 2012-11-21T21:28:55Z Indexed on 2012/11/21 23:01 UTC
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Filed under:

dhcp

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dhcp-server

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isc-dhcp

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lease

When exactly does ISC dhcpd forget a lease that is not explicitly freed by the client?

Context: I am running an installation with many small pools (3 address) and it does not seem to cope well when all three leases are taken. Nevertheless I see entries in dhcpd.leases-file whose end date has passed. Also, these entries are counted towards the number of used leases for the adaptive lease time feature. Shouldn’t these be considered unused?

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