Have you actually confirmed that both devices are getting the same IP address offered via DHCP, or is it just that one of the clients is using that address without DHCP? If the latter, I would strongly recommend you turn on the enable DHCP feature on your VAPs to prevent statically configured clients from getting on at all.
Frank Sweetser Director of Network Operations Worcester Polytechnic Institute "For every problem, there is a solution that is simple, elegant, and wrong." - HL Mencken ________________________________ From: The EDUCAUSE Wireless Issues Constituent Group Listserv <[email protected]> on behalf of Tufts, Mark <[email protected]> Sent: Thursday, September 1, 2016 2:11 PM To: [email protected] Subject: [WIRELESS-LAN] Wireless clients with dup IP address causing issues. Hi, Since the students came back we have has high CPU utilization come and go on our core routers. After much time looking at traffic patterns we have seen this traffic coming only from our Aruba IAP VC buildings. We have other building have Juniper wireless with a central controller. The reason for the high CPU appears to be two wireless devices getting the same IP address. Once this happens gratuitous arps flood the uplinks and crush our CPUs The leases in our DHCP server mark them as bad. We are using Microsoft DHCP. Has anyone experienced anything like this? Thanks, Mark ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/. ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
