dhcp 3.0.5 crashes with lots of lease imbalance messages

[Matt Causey]

How big are the pools?  How many clients total?  What volume of  
DHCPACKs per minute are you processing at the time of failure?

Hate to say it, but you should consider trying a newer version of the  
server.  I'm sure there is some diagnosis you can try with what you  
are running, but there have been a lot of bugfixes in the last 3 years  
since that release.

--
Matt

On Dec 11, 2009, at 0:59, "K. K. Tam" <k.k.tam at ust.hk> wrote:

> Hi,
>
> Our site is running dhcp 3.0.5 in failover and the primary and  
> secondary servers are with CentOS 4.
> The service has been very stable since its rollout in 2007.  A few  
> months ago, we have set up a few
> IP pools with relatively short lease time from 15 minutes to 30  
> minutes.  Then the dhcpd in the
> primary server would crash from time to time with lots of "lease  
> imbalances - lts" messages as
> below.
>
> Dec 11 01:33:55 <hostname> dhcpd: lease imbalance - lts = 23
> Dec 11 01:33:55 <hostname> dhcpd: lease imbalance - lts = 17
> Dec 11 01:33:55 <hostname> dhcpd: lease imbalance - lts = 3
>
> The number of these messages ranges from 800 to 1000 before the  
> daemon crashes.  It is observed
> that crash happens as the usage in these pools increases.  The MCLT  
> in our set up is 1800.  Our
> current workaround is to extend the lease time of these pools to 30  
> minutes and 2 hours with
> the trade off of IP usage.  The situation improves a bit but still  
> has crashes from time to time.
> The worst case we had before extending some to 2 hours lease time  
> was crashes around every 5 to
> 10 minutes for the whole afternoon till the usage slowed down.  We  
> have about 12000 available
> IPs and the active usage is around 60%.
>
> I have searched the archive of the mailing list and the problem  
> happened for some previous version
> yet there was no concrete solution.  I wonder if anyone can provide  
> some suggestions or solutions for
> this problem.
>
> Thanks in advance.
>
>
> Regards,
> K. K. Tam
>
> Email: k.k.tam at ust.hk
>
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