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Fast download, slow upload

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  • 1.  Fast download, slow upload

    Posted Aug 03, 2020 09:38 AM

    Hi there,


    Currently testing a 505 AP but facing an issue.

    When I speedtest my devices I get very fast 500mbps download but only 50mbps upload. The problem is not the link. If I connect the same device to my previous (Cisco) infrastructure I get 500mbps for both upload and download.

    This is a controller based install.

    Any idea what can be the problem here?



  • 2.  RE: Fast download, slow upload

    Posted Aug 03, 2020 10:32 AM



    • Are you testing from the same wireless vlan for both Aruba and Cisco setups?
    • Did you check any interface errors on the ports of the controller or APs?
    • Do you have any shaping configured?
    • Did you try to test to an internal IPerf server connected to the wired network instead of Speedtest (use the -R option to test in the reverse direction as well)

  • 3.  RE: Fast download, slow upload

    Posted Aug 03, 2020 11:12 AM

    Hi Ayman,


    Same client VLAN, yes. And both Cisco and Aruba controllers are connected to the same switch.

    No errors on ports and no shaping.

    iPerf shows the same behavior.



  • 4.  RE: Fast download, slow upload

    Posted Aug 05, 2020 01:18 PM


    This seems to be a problem with HE / 802.11ax.

    As soon as I disable High Efficiency / 802.11ax, upload and download become fast.

    Anyone else having problems?



  • 5.  RE: Fast download, slow upload

    Posted Aug 10, 2020 07:06 AM

    Is anyone running 802.11ax with 5xx series and HE enabled without issues?

  • 6.  RE: Fast download, slow upload

    Posted Aug 11, 2020 06:58 AM



    Are you noticing the same behavior on different types of clients ( windows, mobile phones) etc  ?


    In case of windows, can you please update to latest driver and test it out.

  • 7.  RE: Fast download, slow upload

    Posted Aug 11, 2020 07:19 AM


    Unfortunately iPhone 11 are my only 802.11ax clients.

  • 8.  RE: Fast download, slow upload

    Posted Aug 11, 2020 07:41 AM

    Probably not the case, but did you create any BW Contracts to restrict up/down bandwidth?

  • 9.  RE: Fast download, slow upload

    Posted Aug 11, 2020 07:48 AM

    Also, that would be in place with both HE enabled and HE disabled.

    And in this case, HE disabled "fixes" the issue.

  • 10.  RE: Fast download, slow upload

    Posted Nov 17, 2021 07:54 AM
    Hi all,

    We're seeing a similar issue. We have a client with a homebuilt PC (a whole other headache) on our campus deployment. Netgear A7000 wifi adapter on a Windows 10 devices. Super fast downloads, incredibly slow uploads on eduroam with a NAT IP. I ended up sending a silent, non-NAT SSID out there, HE enabled, and the client reported 100 down and up, but only on 2.4. The client is 5 capable, so I tried removing the 2.4 radio from the AP Group and the client did connect to 5, but the speeds were back to fast down, slow up. I put the 2.4 back on, and sure enough the client ended up reconnecting with steadier speeds.

    Our setup is 2 MMs, 6 MDs, running on 515 APs. Is this simply just a case of a wonky client adapter? Is there anything people can recommend we try to figure out the issue?


    Brian Simpson

  • 11.  RE: Fast download, slow upload

    Posted Nov 22, 2021 09:04 AM
    We facing the same issue with RAP's. We used to have about 400/400Mbps wired and wireless (80MHz channel) but now we have problem and got about 200/20Mbps and packets drops. I can't figure out what caused this, i have tried older firmware and other MC both 7220 cluster and VMC but with no success.

    Running, before on two 7220 in a cluster (for our campus-AP) and moved RAP's to a VMC-50.

    Edit: We running 500-series AP, 503H, 505H, 505, 515 and 535 and problem is not related to specific model what i can see so far.

    Emil Andersson