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Why do some Wireless NICs Disassociate Without Traffic for a Period of Time?

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Article ID: KB5039 KB Last Updated: 22 Jul 2010Version: 4.0
Summary:

Why do some Wireless NICs Disassociate Without Traffic for a Period of Time?

This article describes how to change the timeout period and the aging interval for wireless connections.  This article is written for the wireless NS-5GT and the wireless SSG products.

Symptoms:

Environment:

  • Wireless NIC

Symptoms & Errors:

  • SSID Station Timeout
  • SSID Disassociates
  • Some SSID Stations Disassociate, but others do not.

 

Solution:

The NetScreen-5GT Wireless and SSG Wireless have a mechanism that purges inactive stations without traffic for a specific period of time.  You can vary the timeout period using the CLI command:

5GT Wireless command:
set wlan advanced aging-interval <number>       
     where <number> is the aging interval value (range: 60 - 1000000)

SSG Wireless commands:
set wlan 0 advanced aging-interval <number>         
set wlan 1 advanced aging-interval <number>         
     where <number> is the aging interval value (range: 60 - 1000000)

     0  will set 2.4GHZ wlan
     1  will set 5GHZ wlan

You can alternatively disable the aging with the following command:

5GT command:
set wlan advanced aging-interval disable

SSG Wireless commands:
set wlan 0 advanced aging-interval disable
set wlan 1 advanced aging-interval disable

     0  will set 2.4GHZ wlan
     1  will set 5GHZ wlan

Some Wireless NICs never time out.  The reason for this is some wireless NICs have a keepalive function which allows a non-NULL data frame to be sent every 10 seconds, so that the AP will know that the station is alive.

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