airconnect 9550: ARP broadcast not getting through

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MicrosoftInternetExplorer4

My problem is that ARP broadcasts from the LAN to the WLAN won't get through the access point. That of course causes problems for the wireless users. The problem does NOT appear immediately after connecting to the WLAN.  It happens after a while, not sure how long. Maybe minutes or a few hours. I am using firmware 1.6.2.

Have anybody experienced the same problem?

Have anybody found a solution?

I have read that it quite common with issues with AP:s and wpa/wpa2 concerning ARP broadcast and the group key.

http://serverfault.com/questions/131136/ping-replies-from-same-computer-with-destination-host-unreachable-no-route-t

I also read about something similar for another 3com AP: http://knowledge.3com.com/service/main.jsp?t=solutionTab&ft=searchTab&ps=solutionPanels&locale=en_US&_dyncharset=UTF-8&curResURL=%2Fservice%2Fmain.jsp%3Ft%3DsearchTab%26locale%3Den_US%26_dyncharset%3DUTF-8%26SearchButton%3DFind%26topicName%3D%26searchstring%3DNBX%252520-%252520Phones%252520display%252520%252522all%252520ports%252520busy%252522%252520when%252520accessing%252520voicemail%252520using...

I will now try to change the "

Group Key Update Interval " to 0.

Thankful for any help.

Regards,

/C