Constant DHCPREQUEST and DHCPACK between devices and server
dhcp1 at thehobsons.co.uk
Thu Sep 13 11:59:31 UTC 2012
<Campbell.ColinD at police.qld.gov.au> 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
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