Hello, Dear All.
We have typical deployment with WLC550x (184.108.40.206) and 16 APs (AIR-LAP1242G-E-K9) placed on same site. WLC connected to 3560 (with LAG , and dhcp relay) , and all wireless clients( Motorolla MC3100 handled PC ) work with same WPA2-PSK SSID. All APs configured as HREAP group and SSID has local switching and auth settings. DHCP server for clients work on Windows 2008r2 failover cluster, APs give addresses from WLC builtin server.
Almost all works great. But sometimes some clients go insane . After wake up, they show duplicate IP error and wont connect to nework. On DHCP server this IP shown as leased to client mac(without any errors and so).
Client reboot wont resolve this issue.
After reboot client try another dhcp address (after marking dchp decline message) but also without luck, with same error and another IP.
All this looks like client side problem . But when i try debug arp on root switch 3560 i get following situation.
After client wake-up
*Apr 10 18:44:32.773: IP ARP: rcvd req src 10.116.51.59 0023.68cb.a8fc, dst 10.116.51.59 Vlan51
*Apr 10 18:44:32.782: IP ARP: rcvd req src 10.116.51.59 0023.68cb.a812, dst 10.116.51.59 Vlan51
*Apr 10 19:16:40.123: IP ARP: rcvd req src 10.116.51.24 0023.68cb.a8fc, dst 10.116.51.24 Vlan51
*Apr 10 19:16:40.131: IP ARP: rcvd req src 10.116.51.24 0023.68c9.a29b, dst 10.116.51.24 Vlan51
*Apr 10 19:16:40.459: IP ARP: rcvd req src 10.116.51.27 0023.68cb.a8fc, dst 10.116.51.27 Vlan51
*Apr 10 19:16:40.467: IP ARP: rcvd req src 10.116.51.27 0023.68cb.a9b6, dst 10.116.51.27 Vlan51
Where 0023.68cb.a8fc problem clent mac and 0023.68cb.a812,
0023.68cb.a9b6, 0023.68c9.a29b - another full working clients MACs(with another ip address).
Looks like another client (or ?? ap or controller) send ARP reqest with same IP right after problem client. How this possible ?
appreciate for any opinions
I had a client that had the same issues on certain laptops and they had to tweak the power save setting on the device. Now I'm not a big fan of upgrading code, but 220.127.116.11 has worked better in my deployments than the other previous 7.0.x versions. One thing you can also try is to enable passive mode in the wlan to see if that helps with your devices.
So to undersand your setup, you have the WLC and AP's in the same site, but instead of running the ap's in local mode, you have them in h-reap. And all AP's are in one h-reap group and you are not using 802.1x?