Cleanup leases?

[B. Cook]

Hello All,

I have a /25 defined for about 64+ laptops, and for low public usage 
here at the library..
today I have started to receive the 'no free leases' entry in the logs..

I am going in and removing leases that ended about 20+ days ago..

How can I keep this file cleaned up so that people that need leases will 
get them back from people that are no longer using them?

Thanks in advance.

- Brian