backup WLC's error log message

[cscyangyu]

I added a backup WLC last weekend , and it works fine. but from 2 days ago , this WLC always show a error log message:

Jan 16 16:52:21.553 dtl_net.c:1299 DTL-1-ARP_POISON_DETECTED: STA [00:18:de:c5:1a:4c, 0.0.0.0] ARP (op 1) received with invalid SPA 143.242.12.25/TPA 143.242.12.1

Does anyone can tell me what problem is and let me know how to fix it.

Thanks

[jeff.kish]

Well, I can at least tell you that it's not an error message. WLCs are always listening for IDS signatures. In this case, it's detecting something that remembles an ARP poisoning attacking. Whether it's real or not will take some investigation, and you might need to call TAC to find out the best way to troubleshoot.