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How can I investigate ping loss with strong signal?

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I have a new build with an Intel 8265 Wifi adapter. I am experiencing 
considerable traffic loss (local gateway ping loss of around 50%), even 
though the signal is reported to be above 50% strength (45/70) and the NIC 
association to the AP doesn't drop. Thinking that the problem could have 
been related to the NIC, I bought an ALFA AWUS036AC adapter (rtl8812au), 
which is showing a similar behaviour. No other devices are showing the 
same problem, even when operated nearby the NICs that I have mentioned. 
Before the new build, I used to work on my laptop which was located 
roughly in the same spot on the desk where the desktop PC is now and I 
never had this problem.

How can I determine whether it is an interference problem or something 
software-related (e.g. congested TCP traffic on the host)? The output of 
dmesg doesn't show anything suspicious. As mentioned earlier, there are 
no repetitive loss of association with the AP, just traffic loss (unable 
to reach remote locations as well as the local router).

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Thread

How can I investigate ping loss with strong signal? Gabriele <phoenix1987@gmail.com> - 2018-08-11 15:33 +0000
  Re: How can I investigate ping loss with strong signal? William Unruh <unruh@invalid.ca> - 2018-08-11 16:35 +0000
    Re: How can I investigate ping loss with strong signal? Gabriele <phoenix1987@gmail.com> - 2018-08-12 10:19 +0000
      Re: How can I investigate ping loss with strong signal? Bit Twister <BitTwister@mouse-potato.com> - 2018-08-12 06:10 -0500
        Re: How can I investigate ping loss with strong signal? Doug Laidlaw <laidlaws@hotkey.net.au> - 2018-08-13 01:01 +1000

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