Wi-Fi latency / lost packet issues sending large ICMP pings over Wi-Fi -- not stable

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Wi-Fi latency / lost packet issues sending large ICMP pings over Wi-Fi -- not stable

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Wi-Fi latency / lost packet issues sending large ICMP pings over Wi-Fi -- not stable
Wi-Fi latency / lost packet issues sending large ICMP pings over Wi-Fi -- not stable
2024-01-05 15:45:03
Model: Archer AXE75  
Hardware Version: V1
Firmware Version: 1.1.9 Build 20231115 rel.37295(5553)

setup: TP link router (as a router) behind my main router (at 192.168.1.1).

 

When I connect my laptop Wi-Fi to a TP-Link AXE75 (just two feet away from the laptop) and run fastping (Google "duckware network speedtest tool")

 

    fastping -n:1000 192.168.1.1

 

The result is really bad loss of packets:

 

e8fe97c53e9e4beeb3643d20e8b5c2da

 

When I replace the TP-Link router with a Netgear RAX50 (same config), fastping works great.

 

Why do TP-Link routers have a problem with large ICMP pings?

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#1
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6 Reply
Re:Wi-Fi latency / lost packet issues sending large ICMP pings over Wi-Fi -- not stable
2024-01-05 20:26:44

Also happens when using Windows "ping" command line tool:

 

c:\>ping -l 62500 192.168.0.1

Pinging 192.168.0.1 with 62500 bytes of data:
Reply from 192.168.0.1: bytes=62500 time=2ms TTL=64
Request timed out.
Request timed out.
Request timed out.

Ping statistics for 192.168.0.1:
    Packets: Sent = 4, Received = 1, Lost = 3 (75% loss),
Approximate round trip times in milli-seconds:
    Minimum = 2ms, Maximum = 2ms, Average = 2ms
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#2
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Re:Wi-Fi latency / lost packet issues sending large ICMP pings over Wi-Fi -- not stable
2024-01-05 20:48:38

TP-Link router has some bug with number of ip fragements (fragment reassembly)

 

This seems to work (33 fragments):

 

fastping -l:48832 -n:1000 192.168.0.1

This is the point at which things start to fail (34 fragments):

 

fastping -l:48833 -n:1000 192.168.0.1
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#3
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Re:Wi-Fi latency / lost packet issues sending large ICMP pings over Wi-Fi -- not stable
2024-01-06 10:28:06

TP-Link support, thanks for the private reply, but you don't understand the problem.  "Large" ping means large sized ping, not large RTT response times as your reply incorrectly assumes.

 

I also have an AX80, and it has the same problem, only much worse, as seen below:

 

c:\>fastping -l:50000 192.168.0.1
2024/01/06 05:18:37
fastping.exe -n:10 -l:50000 -ms:0 -w:1000 -i:64 192.168.0.1

nSeq    nHost   tSent   ms      Mbps    info
0       0       0.000   *       0.0     IP_REQ_TIMED_OUT
1       0       1.004   *       0.0     IP_REQ_TIMED_OUT
2       0       2.005   *       0.0     IP_REQ_TIMED_OUT
3       0       3.008   *       0.0     IP_REQ_TIMED_OUT
4       0       4.010   *       0.0     IP_REQ_TIMED_OUT
5       0       5.012   *       0.0     IP_REQ_TIMED_OUT
6       0       6.014   *       0.0     IP_REQ_TIMED_OUT
7       0       7.017   *       0.0     IP_REQ_TIMED_OUT
8       0       8.019   *       0.0     IP_REQ_TIMED_OUT
9       0       9.021   *       0.0     IP_REQ_TIMED_OUT
----------

c:\>fastping -l:40000 192.168.0.1
2024/01/06 05:18:57
fastping.exe -n:10 -l:40000 -ms:0 -w:1000 -i:64 192.168.0.1

nSeq    nHost   tSent   ms      Mbps    info
0       0       0.000   2.514   254.5
1       0       0.012   2.026   315.8
2       0       0.015   2.073   308.7
3       0       0.018   2.008   318.7
4       0       0.020   1.959   326.6
5       0       0.023   1.941   329.7
6       0       0.025   3.055   209.4
7       0       0.029   1.943   329.3
8       0       0.032   2.089   306.3
9       0       0.034   1.974   324.2
----------
800000+840 bytes in 21 ms (296.8 Mbps)
Errors: 0  Hung: 0

 

--> The TP-Link bug is that TP-Link routers can not handle ICMP packets composed of too many fragments.  Please forward that to FW teams to fix.  Netgear (and other brands) do not have this bug.

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#4
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Re:Wi-Fi latency / lost packet issues sending large ICMP pings over Wi-Fi -- not stable
2024-01-08 11:18:07

TP-Link support,  Since you are having so much trouble understanding the problem (the last email from support ignored what I wrote above), let's greatly simplify the test setup so that there is only a single TP-Link device:

 

  • Plug in TP-Link router (I am testing AX80 and AXE75, both have problems), set it up and unplug the Ethernet cable.  So now there is only the TP-Link router and NO other equipment.
  • Now ping the TP-Link router with an ICMP ping of size 48,000 -- notice that ping works
  • Now ping the TP-Link router with an ICMP ping of size 50,000 -- notice that ping breaks
  • repeat test with any modern Netgear router and note that ping never breaks
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#5
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Re:Wi-Fi latency / lost packet issues sending large ICMP pings over Wi-Fi -- not stable
2024-01-09 22:36:28

Additional info:

  • This bug is only with Wi-Fi interfaces.  The bug does not happen when LAN ports are used.
  • I do not see the bug when using a BE550

 

 

 

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#6
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Re:Wi-Fi latency / lost packet issues sending large ICMP pings over Wi-Fi -- not stable
2024-01-10 16:44:58

Can anyone else replicate this issue with the TP-Link AX80 and a Windows computer Wi-Fi?  If not, that is important info as well.

 

ping -l 62500 192.168.0.1

 

where 192.168.0.1 is the ip address of the TP-link router (AX80).

 

 

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#7
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