Changes between Version 9 and Version 10 of Internal/AtherosDriverLimits


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Timestamp:
Sep 14, 2006, 3:55:20 PM (18 years ago)
Author:
Gautam D. Bhanage
Comment:

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  • Internal/AtherosDriverLimits

    v9 v10  
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    33 Virtual access point(s) may be defined as logical abstraction(s) built on an underlying physical device.  Once defined on a physical device each virtual access point is capable of operating as an independent entity from other virtual devices defined on the same physical device. The current Atheros cards on the orbit nodes come with a MadWifi driver that supports setting up of multiple virtual access points on a single physical device.
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    6 == Topologies For Virtualization Validation ==
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    8  === Multiple Virtual Access Points, Single Physical Device ===
    9  Experiments were setup to model a simple scenario as a starting point. The sample topology that was setup is indicated in the diagram. Here the single physical device on the 802.11 card was configured to act as multiple virtual access points. Nodes defined as stations were connected to the corresponding virtual access point on the same physical device by explicitly using an essid to connect to the access point. Iperf was used to make sure that all the individual links in such a scenario were working. Explicit ip address allocation with sub-netting was done to make sure that the underlying gigabit back bone was not used and the defined wireless interfaces were exercised by Iperf.
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    11  === Multiple Stations Multiple Access Points ===
    12  This topology is shown in the figure attached at the bottom of the page.
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    155== Limitations With the Virtual Device Declarations ==
    … …  
    199 * If a single station is defined on a physical device then no more virtual devices may be created on the same physical device.
    2010 * If a virtual access point (master) is created on a physical device then upto a single station (with the nosbeacon – this flag will disable the use of the hardware beacon timers for the station mode operation of the device.) and upto a total of 3 more virtual access point may be defined on the same underlying physical device.
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     12== Test Topologies ==
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     14 === Multiple Virtual Access Points, Single Physical Device ===
     15 Experiments were setup to model a simple scenario as a starting point. The sample topology that was setup is indicated in the diagram. Here the single physical device on the 802.11 card was configured to act as multiple virtual access points. Nodes defined as stations were connected to the corresponding virtual access point on the same physical device by explicitly using an essid to connect to the access point. Iperf was used to make sure that all the individual links in such a scenario were working. Explicit ip address allocation with sub-netting was done to make sure that the underlying gigabit back bone was not used and the defined wireless interfaces were exercised by Iperf. This topology is shown in the figure attached at the bottom of the page.
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