Wireless Access

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Access network design for branch, remote, outdoor and campus locations with Aruba access points, and mobility controllers.
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Aruba IAP 105 Bandwidth throttled to 60%

  • 1.  Aruba IAP 105 Bandwidth throttled to 60%

    Posted May 28, 2018 12:26 AM
      |   view attached

    I'm not able to get complete internet bandwidth even if Transmit rate is 300 Mbps. My input internet bandwidth is 250Mbps. Even at TX 300Mbps, I see max 160Mbps with speedtest.net  If I get any other router/access point, I do get 250Mbps. I see the bandwidth is always throttled to 60% of transmit rate available. This is not the case with other Wi-Fi routers I was testing. I'm on firmware version 6.4.4.4-4.2.3.2_54910

     

    Here are few settings which I have tried:

    ARM

    Band steering mode: 5Ghz

    Airtime fairness mode: Preferred Access
    Min transmit power: 12

    Max transmit power: Max

     

    WLAN setting

    Broadcast filtering: ARP

    Multicast transmission optimization: disabled

    Dynamic multicast optimization: disabled

     

    My full dump of running configs I have attached.

    Any pointers to resolve this issue would be of great help.

    Thanks!

    Attachment(s)

    txt
    aruba_dump.txt   253 KB 1 version


  • 2.  RE: Aruba IAP 105 Bandwidth throttled to 60%

    Posted May 28, 2018 03:48 AM

    The connection speed in Wireless is not equal to the TCP Throughput that you measure with a SpeedTest.

     

    First, there is a lot of error correction and other overhead second Wireless is a half-duplex medium. So the traffic from AP to the client shares the same 'airtime' with the traffic from client to AP. As a (very) rough estimate, if you get half of the link speed as TCP throughput in a linktest, the network is performing quite okay and that is expected.

     

    The numbers that you report seem pretty acceptable to me for a 300 Mbps 802.11n connection. You can't expect to get a speedtest at the rate something even near to the link speed.

     

    This advertised speed versus nominal TCP throughput is something across the industry where higher numbers look better on datasheets.