topic Loosing packets when roaming in Wireless

Loosing packets when roaming

pbuch — Sat, 03 Jul 2021 23:28:35 GMT

I have a warehouse with a quite simple setup.

Its 2x 3750E switches and 2x 4402 controllers.

The accespoints are 16 x 1252.

When i drive around in the warehouse with a continuos ping running, i loose one and sometimes 2 pings when roaming.

The WLC's are running 5.1.151

Help !

PerB

Re: Loosing packets when roaming

grzegorz.ciolek — Sun, 14 Sep 2008 09:17:31 GMT

Are you using CCX?

What type of vendor adapter do you have in mobile stations?

Which supplicant are you using? (WZC does not support CCX)

Are you using WPA or WPA 2 (WPA does not support roaming)

What security are you using? (PSK, 802.1X or 802.1X+CCKM)

There is many factors which have influence on roaming. Give us more info.

Cheers

Greg

Re: Loosing packets when roaming

pbuch — Sun, 14 Sep 2008 19:28:29 GMT

Thanks 🙂

It's Intermec terminals on the rolling equipment. Only WPA is supported.

We are using WPA-PSK right now.

I will collect more info tomorrow

PerB

Re: Loosing packets when roaming

Scott Fella — Sun, 14 Sep 2008 19:36:23 GMT

Like Greg mentioned, wpa does not support fast roaming which causes you to loose connection for a while. Caching support in WPA2 allows you to reconnect to an access point that you've recently connected to without the need to re-authenticate again. Without PMK (as in WPA2) you can expect re-authentication to take around one second, which can cause your application to break.

Re: Loosing packets when roaming

pbuch — Fri, 19 Sep 2008 05:05:07 GMT

Just tested yesterday with a normal laptop.

Configured a wireles SSID on the a radios, WPA2-PSK. When driving around in the warehouse, the pc was loosing lots of packets.

Sometimes it was roaming withiut loosing a ping, but in other cases loosing op to 5 pings. The warehouse is empty and signal is fine.

Re: Loosing packets when roaming

Scott Fella — Fri, 19 Sep 2008 12:21:53 GMT

You have 2 WLC's, is your mobility setup correctly? As far as LAP's go, are they all on one wlc or did you split them up?

Re: Loosing packets when roaming

pbuch — Sat, 20 Sep 2008 06:27:48 GMT

Same mobility group on both WLC's.

It's 2 x 4402-12 and all AP's are on the same controller. I will end up with 16-18 AP's but at this time only 10 of them are installed.

/PerB

Re: Loosing packets when roaming

Scott Fella — Sat, 20 Sep 2008 12:38:55 GMT

I don't know why you would loose that many pings during a roam. If you feel comfortable, can you post your show run-config so I can look at if the configuration need something changed.

Re: Loosing packets when roaming

pbuch — Sun, 21 Sep 2008 06:47:34 GMT

Here it is.

The setup is going in production monday, and i am not happy with this behavior.

/PerB

Re: Loosing packets when roaming

Scott Fella — Sun, 21 Sep 2008 12:01:28 GMT

I hear you. Can you post the show run-configuration. You posted the show running-configuration.

Try disabling Aggressive Load Balancing and WMM unless your scanner supports that. I will wait to see the run-configuration.

Re: Loosing packets when roaming

pbuch — Sun, 21 Sep 2008 14:55:25 GMT

Sorry, but here is run-config.

Re: Loosing packets when roaming

Scott Fella — Sun, 21 Sep 2008 19:30:13 GMT

You only have 7 ap's on this controller but you said you had a total of 10. If you have 10 and a user roams from an ap on this controller to an ap on the other controller, you will have timeouts. This because you also don't have both controllers configured in the mobility group setting. Also you need to configure the service port with an ip address that is not routable in your network. Just configure the port but don't attach that to the network. After you makes these changes and you still have issues, disable aggressive load balancing and WMM and see if that helps.