For a few years now, I've been using a TP-Link Archer C7 and an old TP-Link RE580D repeater as a 5GHz bridge to an outbuilding about 50m away.
The problem is that neither device has had a firmware update for many years plus I want to configure dedicated Wireless Access Points for IoT type devices.
So, I installed 19.07.2 on the C7 and replaced the RE580D with another C7. Again, everything worked OK.
The issue arose when I replaced the 'main' C7 with an R8000 (also 19.07.2) running a similar configuration and now I see latency and dropped packet spikes about every 15 minutes.
I replaced the remote C7 with the original RE580D and the problem persists. Replace the R8000 with the original C7 and the problem goes away. Conclusion: The R8000 is the root of the problem!
My configuration is as follows
Server R8000
10.0.0.43 <--GigE--> 10.0.0.5
^
|
5GHz
|
v
RE580D Client
10.0.0.85 <--GigE--> 10.0.0.41
I monitor these devices and remote connectivity from both sides of this link using collectd so theres a few latency graphs that may help to illustrate the problem. (The original C7 was swapped back to the R8000 at ~6am). The 'droprate' graphs show a similar profile so I've not included them. I've also shown the latency graphs from the client to the server rather than the R8000 as the R8000 and the main C7 have different IP addresses.
The application isn't especially latency or performance sensitive but this really shouldn't be happening. There's no messages in the system log to suggest any problems and a laptop connected to the same SSID on the R8000 doesn't disconnect. Running WinFi on the same laptop doesn't show that RSSI drops or any other problem.
Can anybody suggest what's going on and how to fix it?
I've also run an iperf3 test when this happens and performance drops through the floor when this happens!
[root@server R8000]# iperf3 -c10.0.0.41 -t300 -i1 -P1 [210/1916]
Connecting to host 10.0.0.41, port 5201
[ 4] local 10.0.0.43 port 37514 connected to 10.0.0.41 port 5201
[ ID] Interval Transfer Bandwidth Retr Cwnd
[ 4] 0.00-1.00 sec 32.3 MBytes 271 Mbits/sec 0 1.01 MBytes
[ 4] 1.00-2.00 sec 38.8 MBytes 325 Mbits/sec 0 2.00 MBytes
[ 4] 2.00-3.00 sec 38.8 MBytes 325 Mbits/sec 0 2.89 MBytes
[ 4] 3.00-4.00 sec 40.0 MBytes 336 Mbits/sec 0 2.89 MBytes
[ 4] 4.00-5.00 sec 37.5 MBytes 315 Mbits/sec 0 2.89 MBytes
[ 4] 5.00-6.00 sec 40.0 MBytes 336 Mbits/sec 0 2.89 MBytes
[ 4] 6.00-7.00 sec 36.2 MBytes 304 Mbits/sec 1 2.19 MBytes
[ 4] 7.00-8.00 sec 38.8 MBytes 325 Mbits/sec 0 2.37 MBytes
[ 4] 8.00-9.00 sec 37.5 MBytes 315 Mbits/sec 0 2.52 MBytes
[ 4] 9.00-10.00 sec 41.2 MBytes 346 Mbits/sec 0 2.63 MBytes
[ 4] 10.00-11.00 sec 41.2 MBytes 346 Mbits/sec 0 2.72 MBytes
[ 4] 11.00-12.00 sec 36.2 MBytes 304 Mbits/sec 0 2.79 MBytes
[ 4] 12.00-13.00 sec 41.2 MBytes 346 Mbits/sec 0 2.83 MBytes
[ 4] 13.00-14.00 sec 41.2 MBytes 346 Mbits/sec 0 2.84 MBytes
[ 4] 14.00-15.00 sec 33.8 MBytes 283 Mbits/sec 0 2.84 MBytes
[ 4] 15.00-16.00 sec 26.2 MBytes 220 Mbits/sec 0 2.84 MBytes
[ 4] 16.00-17.00 sec 38.8 MBytes 325 Mbits/sec 0 2.84 MBytes
[ 4] 17.00-18.00 sec 36.2 MBytes 304 Mbits/sec 1 2.00 MBytes
[ 4] 18.00-19.00 sec 35.0 MBytes 294 Mbits/sec 0 2.11 MBytes
[ 4] 19.00-20.00 sec 38.8 MBytes 325 Mbits/sec 0 2.21 MBytes
[ 4] 20.00-21.00 sec 40.0 MBytes 336 Mbits/sec 0 2.29 MBytes
[ 4] 21.00-22.00 sec 38.8 MBytes 325 Mbits/sec 0 2.34 MBytes
[ 4] 22.00-23.00 sec 35.0 MBytes 294 Mbits/sec 0 2.37 MBytes
[ 4] 23.00-24.00 sec 36.2 MBytes 304 Mbits/sec 0 2.39 MBytes
[ 4] 24.00-25.00 sec 37.5 MBytes 315 Mbits/sec 0 2.41 MBytes
[ 4] 25.00-26.00 sec 35.0 MBytes 294 Mbits/sec 0 2.41 MBytes
[ 4] 26.00-27.00 sec 36.2 MBytes 304 Mbits/sec 0 2.41 MBytes
[ 4] 27.00-28.00 sec 36.2 MBytes 304 Mbits/sec 0 2.41 MBytes
[ 4] 28.00-29.00 sec 38.8 MBytes 325 Mbits/sec 0 2.41 MBytes
[ 4] 29.00-30.00 sec 37.5 MBytes 315 Mbits/sec 0 2.42 MBytes
[ 4] 30.00-31.00 sec 30.0 MBytes 252 Mbits/sec 0 2.44 MBytes
[ 4] 31.00-32.00 sec 32.5 MBytes 273 Mbits/sec 0 2.47 MBytes
[ 4] 32.00-33.00 sec 33.8 MBytes 283 Mbits/sec 0 2.52 MBytes
[ 4] 33.00-34.00 sec 38.8 MBytes 325 Mbits/sec 0 2.59 MBytes
[ 4] 34.00-35.00 sec 26.2 MBytes 220 Mbits/sec 2 1.31 MBytes
[ 4] 35.00-36.00 sec 35.0 MBytes 294 Mbits/sec 0 1.40 MBytes
[ 4] 36.00-37.00 sec 36.2 MBytes 304 Mbits/sec 0 1.47 MBytes
[ 4] 37.00-38.00 sec 35.0 MBytes 294 Mbits/sec 0 1.51 MBytes
[ 4] 38.00-39.00 sec 30.0 MBytes 252 Mbits/sec 0 1.54 MBytes
[ 4] 39.00-40.00 sec 35.0 MBytes 294 Mbits/sec 0 1.56 MBytes
[ 4] 40.00-41.00 sec 37.5 MBytes 315 Mbits/sec 0 1.57 MBytes
[ 4] 41.00-42.00 sec 32.5 MBytes 273 Mbits/sec 0 1.57 MBytes
[ 4] 42.00-43.00 sec 31.2 MBytes 262 Mbits/sec 0 1.57 MBytes
[ 4] 43.00-44.00 sec 33.8 MBytes 283 Mbits/sec 0 1.57 MBytes
[ 4] 44.00-45.00 sec 35.0 MBytes 294 Mbits/sec 0 1.58 MBytes
[ 4] 45.00-46.00 sec 30.0 MBytes 252 Mbits/sec 0 1.59 MBytes
[ 4] 46.00-47.00 sec 31.2 MBytes 262 Mbits/sec 0 1.61 MBytes
[ 4] 47.00-48.00 sec 33.8 MBytes 283 Mbits/sec 0 1.65 MBytes
[ 4] 48.00-49.00 sec 33.8 MBytes 283 Mbits/sec 0 1.71 MBytes
[ 4] 49.00-50.00 sec 28.8 MBytes 241 Mbits/sec 0 1.77 MBytes
[ 4] 50.00-51.00 sec 32.5 MBytes 273 Mbits/sec 0 1.88 MBytes
[ 4] 51.00-52.00 sec 36.2 MBytes 304 Mbits/sec 0 2.00 MBytes
[ 4] 52.00-53.00 sec 32.5 MBytes 273 Mbits/sec 0 2.15 MBytes
[ 4] 53.00-54.00 sec 26.2 MBytes 220 Mbits/sec 0 2.34 MBytes
[ 4] 54.00-55.00 sec 33.8 MBytes 283 Mbits/sec 0 2.57 MBytes
[ 4] 55.00-56.00 sec 35.0 MBytes 294 Mbits/sec 0 2.82 MBytes
[ 4] 56.00-57.00 sec 35.0 MBytes 294 Mbits/sec 0 2.84 MBytes
[ 4] 57.00-58.00 sec 25.0 MBytes 210 Mbits/sec 1 2.84 MBytes
[ 4] 58.00-59.00 sec 35.0 MBytes 294 Mbits/sec 1 2.00 MBytes
[ 4] 59.00-60.00 sec 35.0 MBytes 294 Mbits/sec 0 2.19 MBytes
[ 4] 60.00-61.00 sec 36.2 MBytes 304 Mbits/sec 0 2.36 MBytes
[ 4] 61.00-62.00 sec 26.2 MBytes 220 Mbits/sec 0 2.49 MBytes
[ 4] 62.00-63.00 sec 33.8 MBytes 283 Mbits/sec 0 2.60 MBytes
[ 4] 63.00-64.00 sec 33.8 MBytes 283 Mbits/sec 0 2.69 MBytes
[ 4] 64.00-65.00 sec 25.0 MBytes 210 Mbits/sec 2 1.91 MBytes
[ 4] 65.00-66.00 sec 27.5 MBytes 231 Mbits/sec 0 2.05 MBytes
[ 4] 66.00-67.00 sec 32.5 MBytes 273 Mbits/sec 0 2.13 MBytes
[ 4] 67.00-68.00 sec 36.2 MBytes 304 Mbits/sec 0 2.20 MBytes
[ 4] 68.00-69.00 sec 32.5 MBytes 273 Mbits/sec 0 2.25 MBytes
[ 4] 69.00-70.00 sec 13.8 MBytes 115 Mbits/sec 0 2.28 MBytes
[ 4] 70.00-71.00 sec 16.2 MBytes 136 Mbits/sec 0 2.30 MBytes
[ 4] 71.00-72.00 sec 31.2 MBytes 262 Mbits/sec 0 2.31 MBytes
[ 4] 72.00-73.00 sec 22.5 MBytes 189 Mbits/sec 0 2.32 MBytes
[ 4] 73.00-74.00 sec 10.0 MBytes 83.9 Mbits/sec 0 2.32 MBytes
[ 4] 74.00-75.00 sec 11.2 MBytes 94.4 Mbits/sec 0 2.32 MBytes
[ 4] 75.00-76.00 sec 30.0 MBytes 252 Mbits/sec 0 2.32 MBytes
[ 4] 76.00-77.00 sec 17.5 MBytes 147 Mbits/sec 1 2.47 MBytes
[ 4] 77.00-78.00 sec 12.5 MBytes 105 Mbits/sec 1 1.87 MBytes
[ 4] 78.00-79.00 sec 28.8 MBytes 241 Mbits/sec 0 2.05 MBytes
[ 4] 79.00-80.00 sec 37.5 MBytes 315 Mbits/sec 0 2.21 MBytes
[ 4] 80.00-81.00 sec 16.2 MBytes 136 Mbits/sec 0 2.29 MBytes
[ 4] 81.00-82.00 sec 18.8 MBytes 157 Mbits/sec 0 2.42 MBytes
[ 4] 82.00-83.00 sec 25.0 MBytes 210 Mbits/sec 0 2.50 MBytes
[ 4] 83.00-84.00 sec 15.0 MBytes 126 Mbits/sec 0 2.55 MBytes
[ 4] 84.00-85.00 sec 15.0 MBytes 126 Mbits/sec 0 2.59 MBytes
[ 4] 85.00-86.00 sec 5.00 MBytes 41.9 Mbits/sec 0 2.59 MBytes
[ 4] 86.00-87.00 sec 1.25 MBytes 10.5 Mbits/sec 0 2.60 MBytes
[ 4] 87.00-88.00 sec 0.00 Bytes 0.00 bits/sec 0 2.60 MBytes
[ 4] 88.00-89.00 sec 0.00 Bytes 0.00 bits/sec 0 2.60 MBytes
[ 4] 89.00-90.00 sec 0.00 Bytes 0.00 bits/sec 0 2.60 MBytes
[ 4] 90.00-91.00 sec 0.00 Bytes 0.00 bits/sec 0 2.60 MBytes
[ 4] 91.00-92.00 sec 0.00 Bytes 0.00 bits/sec 0 2.60 MBytes
[ 4] 92.00-93.00 sec 0.00 Bytes 0.00 bits/sec 0 2.61 MBytes
[ 4] 93.00-94.00 sec 0.00 Bytes 0.00 bits/sec 0 2.61 MBytes
[ 4] 94.00-95.00 sec 0.00 Bytes 0.00 bits/sec 0 2.61 MBytes
[ 4] 95.00-96.00 sec 0.00 Bytes 0.00 bits/sec 0 2.62 MBytes
[ 4] 96.00-97.00 sec 0.00 Bytes 0.00 bits/sec 0 2.62 MBytes
[ 4] 97.00-98.00 sec 0.00 Bytes 0.00 bits/sec 0 2.63 MBytes
[ 4] 99.00-100.00 sec 0.00 Bytes 0.00 bits/sec 0 2.65 MBytes
[ 4] 100.00-101.00 sec 0.00 Bytes 0.00 bits/sec 0 2.66 MBytes
[ 4] 101.00-102.00 sec 0.00 Bytes 0.00 bits/sec 0 2.67 MBytes
[ 4] 102.00-103.00 sec 0.00 Bytes 0.00 bits/sec 1 2.68 MBytes
[ 4] 103.00-104.00 sec 0.00 Bytes 0.00 bits/sec 0 2.65 MBytes
[ 4] 104.00-105.00 sec 0.00 Bytes 0.00 bits/sec 0 2.63 MBytes
[ 4] 105.00-106.00 sec 0.00 Bytes 0.00 bits/sec 0 2.63 MBytes
[ 4] 106.00-107.00 sec 0.00 Bytes 0.00 bits/sec 0 2.63 MBytes
[ 4] 107.00-108.00 sec 0.00 Bytes 0.00 bits/sec 214 469 KBytes
[ 4] 108.00-109.00 sec 0.00 Bytes 0.00 bits/sec 36 318 KBytes
[ 4] 109.00-110.00 sec 0.00 Bytes 0.00 bits/sec 56 334 KBytes
[ 4] 110.00-111.00 sec 0.00 Bytes 0.00 bits/sec 60 351 KBytes
[ 4] 111.00-112.00 sec 0.00 Bytes 0.00 bits/sec 56 366 KBytes
[ 4] 112.00-113.00 sec 0.00 Bytes 0.00 bits/sec 61 385 KBytes
[ 4] 113.00-114.00 sec 0.00 Bytes 0.00 bits/sec 13 387 KBytes
[ 4] 114.00-115.00 sec 0.00 Bytes 0.00 bits/sec 29 397 KBytes
[ 4] 115.00-116.00 sec 0.00 Bytes 0.00 bits/sec 2 399 KBytes
[ 4] 116.00-117.00 sec 0.00 Bytes 0.00 bits/sec 0 399 KBytes
[ 4] 117.00-118.00 sec 0.00 Bytes 0.00 bits/sec 0 399 KBytes
[ 4] 118.00-119.00 sec 0.00 Bytes 0.00 bits/sec 0 399 KBytes
[ 4] 119.00-120.00 sec 0.00 Bytes 0.00 bits/sec 0 399 KBytes
[ 4] 120.00-121.00 sec 0.00 Bytes 0.00 bits/sec 0 399 KBytes
[ 4] 121.00-122.00 sec 0.00 Bytes 0.00 bits/sec 0 399 KBytes
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[ 4] 123.00-124.00 sec 0.00 Bytes 0.00 bits/sec 0 399 KBytes
[ 4] 124.00-125.00 sec 0.00 Bytes 0.00 bits/sec 0 399 KBytes
[ 4] 125.00-126.00 sec 0.00 Bytes 0.00 bits/sec 0 399 KBytes
[ 4] 126.00-127.00 sec 0.00 Bytes 0.00 bits/sec 0 399 KBytes
[ 4] 127.00-128.00 sec 0.00 Bytes 0.00 bits/sec 0 399 KBytes
[ 4] 128.00-129.00 sec 0.00 Bytes 0.00 bits/sec 0 399 KBytes
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[ 4] 130.00-131.00 sec 0.00 Bytes 0.00 bits/sec 0 399 KBytes
[ 4] 131.00-132.00 sec 0.00 Bytes 0.00 bits/sec 0 399 KBytes
[ 4] 132.00-133.00 sec 0.00 Bytes 0.00 bits/sec 484 683 KBytes
[ 4] 133.00-134.00 sec 0.00 Bytes 0.00 bits/sec 12 683 KBytes
[ 4] 134.00-135.00 sec 0.00 Bytes 0.00 bits/sec 14 683 KBytes
[ 4] 135.00-136.00 sec 0.00 Bytes 0.00 bits/sec 9 683 KBytes
[ 4] 136.00-137.00 sec 0.00 Bytes 0.00 bits/sec 8 683 KBytes
[ 4] 137.00-138.00 sec 0.00 Bytes 0.00 bits/sec 3 683 KBytes
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[ 4] 156.00-157.00 sec 0.00 Bytes 0.00 bits/sec 53 48.1 KBytes
[ 4] 157.00-158.00 sec 0.00 Bytes 0.00 bits/sec 8 53.7 KBytes
[ 4] 158.00-159.00 sec 0.00 Bytes 0.00 bits/sec 13 53.7 KBytes
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[ 4] 176.00-177.00 sec 0.00 Bytes 0.00 bits/sec 1 1.41 KBytes
[ 4] 177.00-178.00 sec 0.00 Bytes 0.00 bits/sec 15 21.2 KBytes
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[ 4] 181.00-182.00 sec 0.00 Bytes 0.00 bits/sec 0 21.2 KBytes
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[ 4] 196.00-197.00 sec 0.00 Bytes 0.00 bits/sec 1 1.41 KBytes
[ 4] 197.00-198.00 sec 0.00 Bytes 0.00 bits/sec 12 15.6 KBytes
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[ 4] 199.00-200.00 sec 0.00 Bytes 0.00 bits/sec 8 15.6 KBytes
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[ 4] 201.00-202.00 sec 0.00 Bytes 0.00 bits/sec 5 15.6 KBytes
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[ 4] 215.00-216.00 sec 0.00 Bytes 0.00 bits/sec 1 1.41 KBytes
[ 4] 216.00-217.00 sec 0.00 Bytes 0.00 bits/sec 8 11.3 KBytes
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[ 4] 235.00-236.00 sec 0.00 Bytes 0.00 bits/sec 6 8.48 KBytes
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[ 4] 257.00-258.00 sec 0.00 Bytes 0.00 bits/sec 2 7.07 KBytes
[ 4] 258.00-259.00 sec 0.00 Bytes 0.00 bits/sec 1 7.07 KBytes
[ 4] 259.00-260.00 sec 0.00 Bytes 0.00 bits/sec 0 7.07 KBytes
[ 4] 260.00-261.00 sec 0.00 Bytes 0.00 bits/sec 0 7.07 KBytes
[ 4] 261.00-262.00 sec 0.00 Bytes 0.00 bits/sec 0 7.07 KBytes
[ 4] 262.00-263.00 sec 0.00 Bytes 0.00 bits/sec 0 7.07 KBytes
[ 4] 263.00-264.00 sec 0.00 Bytes 0.00 bits/sec 0 7.07 KBytes
[ 4] 264.00-265.00 sec 0.00 Bytes 0.00 bits/sec 0 7.07 KBytes
[ 4] 265.00-266.00 sec 0.00 Bytes 0.00 bits/sec 0 7.07 KBytes
[ 4] 266.00-267.00 sec 0.00 Bytes 0.00 bits/sec 0 7.07 KBytes
[ 4] 267.00-268.00 sec 0.00 Bytes 0.00 bits/sec 0 7.07 KBytes
[ 4] 268.00-269.00 sec 0.00 Bytes 0.00 bits/sec 0 7.07 KBytes
[ 4] 269.00-270.00 sec 0.00 Bytes 0.00 bits/sec 0 7.07 KBytes
[ 4] 270.00-271.00 sec 0.00 Bytes 0.00 bits/sec 0 7.07 KBytes
[ 4] 271.00-272.00 sec 0.00 Bytes 0.00 bits/sec 0 7.07 KBytes
[ 4] 272.00-273.00 sec 21.2 MBytes 178 Mbits/sec 1273 727 KBytes
[ 4] 273.00-274.00 sec 38.8 MBytes 325 Mbits/sec 0 1.87 MBytes
[ 4] 274.00-275.00 sec 36.2 MBytes 304 Mbits/sec 1 1.98 MBytes
[ 4] 275.00-276.00 sec 40.0 MBytes 336 Mbits/sec 0 2.17 MBytes
[ 4] 276.00-277.00 sec 36.2 MBytes 304 Mbits/sec 0 2.34 MBytes
[ 4] 277.00-278.00 sec 40.0 MBytes 335 Mbits/sec 0 2.48 MBytes
[ 4] 278.00-279.00 sec 41.2 MBytes 346 Mbits/sec 0 2.59 MBytes
[ 4] 279.00-280.00 sec 37.5 MBytes 315 Mbits/sec 0 2.67 MBytes
[ 4] 280.00-281.00 sec 38.8 MBytes 325 Mbits/sec 0 2.73 MBytes
[ 4] 281.00-282.00 sec 36.2 MBytes 304 Mbits/sec 1 1.99 MBytes
[ 4] 282.00-283.00 sec 36.2 MBytes 304 Mbits/sec 0 2.10 MBytes
[ 4] 283.00-284.00 sec 41.2 MBytes 346 Mbits/sec 0 2.18 MBytes
[ 4] 284.00-285.00 sec 37.5 MBytes 315 Mbits/sec 0 2.24 MBytes
[ 4] 285.00-286.00 sec 37.5 MBytes 315 Mbits/sec 0 2.29 MBytes
[ 4] 286.00-287.00 sec 37.5 MBytes 315 Mbits/sec 0 2.31 MBytes
[ 4] 287.00-288.00 sec 37.5 MBytes 315 Mbits/sec 0 2.33 MBytes
[ 4] 289.00-290.00 sec 42.5 MBytes 357 Mbits/sec 0 2.34 MBytes
[ 4] 290.00-291.00 sec 38.8 MBytes 325 Mbits/sec 0 2.34 MBytes
[ 4] 291.00-292.00 sec 33.8 MBytes 283 Mbits/sec 0 2.34 MBytes
[ 4] 292.00-293.00 sec 37.5 MBytes 315 Mbits/sec 0 2.34 MBytes
[ 4] 293.00-294.00 sec 37.5 MBytes 315 Mbits/sec 0 2.36 MBytes
[ 4] 294.00-295.00 sec 37.5 MBytes 315 Mbits/sec 0 2.38 MBytes
[ 4] 295.00-296.00 sec 31.2 MBytes 262 Mbits/sec 0 2.42 MBytes
[ 4] 296.00-297.00 sec 37.5 MBytes 315 Mbits/sec 0 2.48 MBytes
[ 4] 297.00-298.00 sec 37.5 MBytes 315 Mbits/sec 0 2.56 MBytes
[ 4] 298.00-299.00 sec 37.5 MBytes 315 Mbits/sec 0 2.67 MBytes
[ 4] 299.00-300.00 sec 36.2 MBytes 304 Mbits/sec 0 2.80 MBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth Retr
[ 4] 0.00-300.00 sec 3.67 GBytes 105 Mbits/sec 2586 sender
[ 4] 0.00-300.00 sec 3.67 GBytes 105 Mbits/sec receiver
iperf Done.
[root@server R8000]#
As a further thought, I'm using Channel 36 on radio0 so I don't think DFS is an issue here.