Garbage collection?

Peter Laws plaws at
Thu Sep 10 16:37:13 UTC 2009

David W. Hankins wrote:
> On Wed, Sep 09, 2009 at 09:30:47AM -0500, Peter Laws wrote:
>> Exactly what we did - 3600 to 1800.  May yet drop it to 900.
> be careful driving the lease time too low.  the lower the lease time,
> the greater the dhcp activity due to renewals.

Roger that.  So far, we're not seeing issues with 1800 s as the lease time. 
    Besides DHCP for the WiFi pool (and several land-line networks) the 
only other thing the system does is DNS slavery and time so it's not too 
terribly busy.

> if you can identify the problematic clients (iphones) in a class
> statement, you can lower the lease time for those clients
> specifically, keeping your avg-lease-time higher.

And if Apple used a specific OUI range for iPhones/iPod Touches, we would 
happily do that (how does that "deny" keyword work again??? :-). 
Unfortunately, that doesn't seem to be the case.  If anyone knows 
different, please, speak up!!


Peter Laws / N5UWY
National Weather Center / Network Operations Center
University of Oklahoma Information Technology
plaws at
Feedback? Contact my director, Craig Cochell, craigc at Thank you!

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