We have a strange issue which only started a few weeks ago.
wlc 5508 ver 18.104.22.168
APs - AIR-LAP1142N-N-K9
we have AP groups setup with mobility between 3 controllers
2 dhcp servers - isc dhcp - lease time is 1 hour
The client MAC OS X 10.6.7 and there seems to be 100s of people being affected
repaired file permissions on one of the MBP - to no avail
The client has mac in sleep mode, wakes up the mac book and tries to connect, at which point the airport connects but does not get an IP.
these errors are on the increase
Client Excluded: MACAddress:x Base Radio MAC :y Slot: 1 User Name: unknown Ip Address: unknown Reason:Attempted to use IP Address assigned to another device. ReasonCode: 3
if the MAC client is connected and moves to another location and another AP in the same controller
The client is excluded and blocked out.
I have disabled dhcp proxy on the controller to no avail.
I have restarted the dhcp servers
I have removed the wireless profile from the client, which helped yesterday, but the problem returned this morning.
It seems to me that the duplicate IP is the same IP of the client,
Also have a lot more of these errors
Client Excluded: MACAddress:x Base Radio MAC :y Slot: 0 User Name: unknown Ip Address: unknown Reason:802.11 Association failed repeatedly. ReasonCode: 2
and when we look up clients MAC address we see that the client has both of these errors with in the same period of time.
We have some clients that are not having this problem at all.
Any thoughts or Ideas would be greatly appreciated