Duplicated leases, same IP and same MAC

Shawn Routhier sar at isc.org
Tue Sep 20 18:24:00 UTC 2011

The dhcpd server updates the lease file by appending
new leases to the end.  With this strategy it's normal
to have multiple entries of a lease in the file as the
server adds entries when it renews or rebinds a lease.

In order to avoid the lease file growing without limit
the server will write a new file every so often - at
which point there would be only one entry per lease
until the server updates the lease in some fashion.


On 09/20/2011 10:01, carlos jorge wrote:
> Hi Arun,
> Thanks for you reply!
> Right now i m not able to do those operations but..
> I don't know if i got your thought but in case of problems with RAS
> (that raise the creation of duplication of leases) why did the
> duplicated lease disappeared?
> if the end time is on both leases are:
> ends 2 2011/09/20 22:57:21;
> and after a while (1h after creation, and a lease time of 8h) 1 of the 2
> got away..
> starts 2 2011/09/20 14:57:21; --> lease creation
> around 16h -->1 of the leases is gone (i m not complaining about this :) )
> ends 2 2011/09/20 22:57:21; --> lease end time
> Do you have any thought for this behavior?
> Thanks,
> Carlos

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