5508 WLC not releasing DHCP addresses

[rickc]

            Have a WLC 5508 running 7.0.230 with internal DHCP server. Timeout is 3600 seconds. The IP addresses never seem to be released.

The controller will show 70 clients but 254 addresses will be assigned. Has anyone else experienced this problem?

[George Stefanick]

Hi Rick,

I dont recall a bug that comes to mind. I will say the general theme is not to use DHCP on the controller. It is not very reliable and has had bugs in the past.

__________________________________________________________________________________________
"Satisfaction does not come from knowing the solution, it comes from knowing why." - Rosalind Franklin
__________________________________________________________________________________________
‎"I'm in a serious relationship with my Wi-Fi. You could say we have a connection."

[Saravanan Lakshmanan]

#Check "Lease remaining time" change in this value on the WLC for the clients that are not currently connected and already connected to it. Watch if its getting removed/refreshed once the lease time is expired.

#Cross reference with cli as well.

#If its an open wlan, client pass by will get an ip, so what admin seeing could be new client keep coming in and its an expected behavior.

#Find if time is static or client's dhcp entry doesn't remove once lease time expired.

#Per design, WLC doesn't release the internal dhcp ip when the client sends deauth to WLC, however, it should when the timer gets expired for clients that were currently not connected.