We are running Cisco WLC 188.8.131.52 as our foreign WLC and anchor WLC in the DMZ. Usually, all is fine but we observe sometimes that client cannot obtain dhcp address anymore. The DHCP server configured is the management interface of the anchor WLC and it works well except that sometimes, is stops working.
The clients are listed as associated client on the Anchor WLC but their status is DHCPREQ.
Sometimes, a reboot is required, sometimes it re-works few hours later without any intervention.
When it happens, we can see dhcp request reaching the Anchor WLC but it is like if no reply is sent.