Stupid "duplicate" question

Shane Kerr Shane_Kerr at
Thu Jun 21 14:48:01 UTC 2007

Hash: SHA1

Jiann-Ming Su wrote:
> What does the following message mean?
> dhcpd: uid lease for client aa:bb:cc:11:22:33 is
> duplicate on MySharedNetwork

The comment in the code says this:

        /* If we got a lease that matched the client identifier, we may want
           to use it, but if we already have a lease we like, we must free
           the lease that matched the client identifier. */

Looking at the code, there are a few ways this can be caused, so I have to guess
as too the actual reason.

One way is having host declarations that match both the hardware and the client

It might also be caused by a client which requests a lease and includes both the
client IP address and a client identifier in the packet. If the server finds a
match for both of these, and they are not the same lease, then it outputs this
error message and uses the lease that matches the client IP address.

As far as I can tell, there is no reason to worry about this log entry.

I am curious to know if we can get more details, so information about the
specific clients that trigger the message would be nice. :)

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