Unknown client alerts and clients not getting IP addresses
dhcp1 at thehobsons.co.uk
Tue Aug 23 07:29:22 UTC 2016
"Fleming, Tony" <t.fleming at tcu.edu> wrote:
> We create a host record for each device that connects to our network
> Over the years our dhcpd.conf file has grown due to little purging (yeah – I know we should be purging the data)
> Suddenly today, we began getting reports users are unable to get an IP address.
> The clients vary from iphones, to OS X and PC laptops
> The issue doesn’t seem to be OS or hardware dependent
> My logs are alerting:
> dhcpd: DHCPDISCOVER FROM xx:xx:xx:xx:xx:xx via x.x.x.x: uknown client
> In my dhcpd file there is a “host” record for each device – so I am scratching my head to why the device isn’t getting an IP address.
> Not all devices are having trouble getting IP leases
> We have removed the directive in dhcpd.conf to “deny unknown clients”
> Now all of our devices are getting IP addresses.
Post your config - not all of it ;-)
But when you trim it, be very very careful that you don't alter the structure at all.
Include a problem client - both it's config and the log entries for it.
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