dhcpd.leases Contains Lots of Very Old Leases

Eric Kenny Eric.Kenny at marist.edu
Fri Feb 6 13:36:25 UTC 2009

Hi Simon,

It seems that they are just the old and expired ones, which appears to be 
normal behavior after further reading.  However, I'm wondering if having 
to parse all of these entries is what's causing DHCP timeouts on the 
client end.

We have about 100 /21 networks served with open ranges. 

Eric J. Kenny
Network Analyst
Marist College 
3399 North Rd.
Poughkeepsie, NY 12601

Simon Hobson <dhcp1 at thehobsons.co.uk>
Users of ISC DHCP <dhcp-users at lists.isc.org>
02/05/09 04:55 PM
Re: dhcpd.leases Contains Lots of Very Old Leases

Eric Kenny wrote:

>We are running dhcpd version 4.1.0a1 and have recently discovered a
>problem with our lease file.  There appears to be quite a number of 
>that expired more than 8 months ago that are still in there.  According 
>the dhcpd.leases man page "From time to time, dhcpd removes obsolete
>information to prevent the file from becoming too large."  It seems like
>this may not be happening.

Are these leases that have been superceded by later entries for the 
same address, or just leases that are old and expired ?

If it's the former then something is wrong. If it's the latter, then 
it's normal as all old leases are kept - in their most recent 
version. Ie, when a client renews, then a new lease record is 
appended - and when the cleanup occurs, the old record will be purged 
so that only the most recent is left.

How big are your pool declarations ? It sounds like they are large.

Simon Hobson

Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.
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