Constant DHCPREQUEST and DHCPACK between devices and server

Glenn Satchell glenn.satchell at
Thu Sep 13 12:51:32 UTC 2012

One of the noticeable changes between those two versions was that in 4.x
the default is to not be authoritative. So try adding an "authoritative;"
statement in the global scope.


On Thu, September 13, 2012 9:59 pm, Simon Hobson wrote:
> <Campbell.ColinD at> wrote:
>>I just upgraded a box from RHEL5.8 (DHCP3.0.5) to RHEL6.3 (DHCP 4.1.1).
>>The leases file was copied from what used to be the server's partner
>>(it's still running RHEL5.8).
>>I now get a constant stream (multiples per second) of
>>DHCPREQUEST/DHCPACK between the devices still active on the network.
>>Anyone know what is happening and how to fix it?
> Did you try looking in the archives ?
> Is the server on the same address, and does it have the same config,
> as the old one ?
> The usual advice is that  either the response isn't making it back to
> the client, or it is in some way not acceptable to the client.
> Use a packet sniffer to see that responses are actually making it
> back to the client's network, and if possible check on the client to
> see that it is receiving it.
> Look in the logs on the client to see if it's seeing the responses
> and/or if it's logging any errors.
> It may be worth forcing a client to explicitly release it's lease and
> see if it works better when doing the full Discover-Ack-Request-Offer
> cycle.
> --
> Simon Hobson
> Visit for books by acclaimed
> author Gladys Hobson. Novels - poetry - short stories - ideal as
> Christmas stocking fillers. Some available as e-books.
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