Lightweight APs drop out after Land Attack

Hi
We have a WLAN consisting of a WLC 4402 and 11 lightweight APs. For security/compliance reasons we have a Cisco PIX firewall that sits between the WLC (outside) and the APs (inside). The APs are allowed to form LWAPP tunnels through the firewall (inside access-list) to the WLC and the WLAN works as expected.
The firewall then limits traffic from the WLAN (outside access list) to certain the internal systems.
I have noticed that every so often the firewall logs show continuous "Land attack from 0.0.0.0 0.0.0.0" messages then all APs are disconnected (all lights flash).
Just wondering if anybody else has seen this or has had a similar setup
TIA
Gary

Hi Sandeep
Forgeot to mention that the firewall is in transparent mode so there isn't any NATing or routing going on. The article doesn't cover the fact that the IP source and destination IP addresses are 0.0.0.0
Regards
Gary

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