dhcpd.leases question

Chris Zimmermann cbzimmermann at mac.com
Thu Aug 17 22:39:38 UTC 2006

excellent news; thank you!

On Aug 17, 2006, at 3:36 PM, Simon Hobson wrote:

> Chris Zimmermann wrote:
>> I'm noticing DHCP leases that have the binding state "free" in my
>> dhcpd.leases file that are a few days shy of being a month old.
>> I couldn't find the information I'm looking for in the man pages
>> (maybe I missed it).  Here's my questions:
>> 1) When, if ever, will these leases be pruned from the dhcpd.leases
>> file?
> Never, or when they get re-allocated to another client - whichever
> comes first ;-)
>> 2) Do these leases count against the pool?  Say my pool runs from
>> through  This allows me to hand out 199
>> leases.  Suppose I have 198 clients with active leases, and this free
>> lease in my file.  Does dhcpd reserve this lease and deny/ignore the
>> 199th DHCP request?  Or will this lease be pruned at that point,
>> since it is free?
> The server will re-allocate a lease when required. It will first
> allocate 'never been used' addresses, then addresses in a free state
> (on a least recently used basis), and finally it will attempt to
> recover addresses that have been marked as abandoned. In the case you
> cite, the free address will be reused.
>> 3) Are there any adverse side effects from this situation?
> Quite the reverse, it is done for stability. No matter how long a
> client has been off the network, it will get it's previous address
> back as long as it hasn't been re-used.
> Simon

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