Intermittent wireless device disconnection with network

vinodk_gupta · ‎10-07-2010

Hi,

We have WLC 4402 & 30 No. of AP is connected. We are facing intermittent network disconnection problem.

During problem we observe following things

Client is not communicating with network while ip address is showing on client machine & sometimes yellow mark is showing on network card adapter. When we are repairing the network card then communication is started. This type of problem is occurring on all machines while wired network is running fine.

WLC network segment is 172.26.150.0/24

We have seen on WLC log & it is showing below types. For reference attaching the same.

Oct 06 13:11:38.848 dtl_net.c:1337 DTL-1-ARP_POISON_DETECTED: STA [58:17:0c:43:e9:f1, 172.26.150.168] ARP (op 1) received with invalid SPA 1.38.188.197/TPA 172.26.150.1

Oct 06 13:11:38.765 dtl_net.c:1337 DTL-1-ARP_POISON_DETECTED: STA [00:1b:77:46:4a:34, 0.0.0.0] ARP (op 1) received with invalid SPA 192.168.1.2/TPA 192.168.1.1

Oct 06 13:11:53.507 dtl_net.c:1337 DTL-1-ARP_POISON_DETECTED: STA [58:17:0c:43:e9:f1, 172.26.150.168] ARP (op 1) received with invalid SPA 1.38.188.197/TPA 172.26.150.1

Please help us to resolve this issue.

Serge Yasmine · ‎10-13-2010

Hi Vinod,

couple of check on your SSID:

1- what security you are using? if you are using anything that involves dot1x without some fast key management such as cckm then on every roaming you will loose connection due to re-auth. if you are not using 802.1x and you say i'm using wpa-psk then it is ok

2- is there any session timeout configured on the ssid? if yes, try to disable it. session time triggers kick-out of client when the session times out

Finally, if above 2 things do not help then ssh/telnet to the wlc and do a "debug client " reproduce the problem and check what the debug is displaying when the problem is happening.

You can also paste it here and will have a look for you

Thanks

Serge

vinodk_gupta · ‎10-14-2010

Thanks

Presently we are using security under SSID as a Layer 2 which is WEP & there are no AAA server. We are not using Layer 3 security under SSID.

we have disable the "Enable seesion timeout" & uncheck the "Aironet IE" as well as increase the time from 300 to 10000 in "user idle timeout session" under controller. Since last 2 days we are in positive condition & kept it underobservation.

thanks again & if we face any problem will let you know.