Unknown client alerts and clients not getting IP addresses
Fleming, Tony
t.fleming at tcu.edu
Mon Aug 22 22:30:18 UTC 2016
Good afternoon folks!
We ran into a problem today and it has me completely dumfounded
Background:
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)
Symptom:
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
Workaround:
We have removed the directive in dhcpd.conf to "deny unknown clients"
Now all of our devices are getting IP addresses.
Questions:
Has anyone experienced a problem like this?
If so, what did you find to be the root cause?
Is it possible my 300k line dhcpd.conf file is causing this behavior?
Could there be a programmatic time-out searching through host records in memory that is causing the host lookup to fail?
Thank you.
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