Should also state here that net.inet.icmp.icmplim=0 and the command I have been 
testing from is: (ping -c 5000 -i 0.1 router)

--- router ping statistics ---
5000 packets transmitted, 5000 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 1.118/4.060/172.031/6.841 ms


> On Oct 29, 2020, at 09:08, J. Hellenthal <jhellent...@dataix.net> wrote:
> 
> I believe I have seen the same thing with a Mid 2015 11,4 running catalina. 
> Not diagnosing further because I could not find a reason for it fast enough 
> and not sure if it really had an impact at the moment…. but could you try the 
> following 
> 
> 
> sudo sysctl net.link.generic.system.hwcksum_tx=0
> sudo sysctl net.link.generic.system.hwcksum_rx=0
> sudo ifconfig en0 -rxcsum
> 
> 
> in reverse … to restore the settings 
> 
> sudo sysctl net.link.generic.system.hwcksum_tx=1
> sudo sysctl net.link.generic.system.hwcksum_rx=1
> sudo ifconfig en0 rxcsum
> 
> 
> If you have some specific tests to run I would be willing to run them here on 
> Big Sur with the same laptop but I have nothing now that runs Catalina
> 
> 
> Wireshark used to in Catalina rack up cksum errors a lot while these were all 
> at their defaults.
> 
> 
> 
>> On Oct 29, 2020, at 08:23, Mark Tinka <mark.ti...@seacom.com> wrote:
>> 
>> 
>> 
>> On 10/29/20 15:04, Cory Sell wrote:
>> 
>>> Might be worth disabling each AP to see if there's one out there having an 
>>> issue playing nice with the MacBook. Also try different combinations of two 
>>> APs working together. It's possible the MacBook is flip flopping because 
>>> the power levels are fighting each other.
>> 
>> Tested all that, as well as dropping Tx power levels on each of the AP's to 
>> Low so that there isn't any power coming from any other AP (despite being 
>> quite far, already).
>> 
>> And to confirm, when the laptop locks into an AP, it doesn't try to join 
>> another one. When in range, power is very good (between -37dB and -52dB). 
>> When I walk away, that AP becomes too far (as bad as -80dB), but the next 
>> one close by is far better (same good values as before) and laptop connects 
>> and sticks to that.
>> 
>> Again, only impacts Catalina. No other Apple device, or the Windows PC that 
>> is on the same WLAN.
>> 
>> 
>>> Does the Mac have this issue at your local coffee shop or another 
>>> establishment with Wi-Fi? You can try to rule out the AirPort card in the 
>>> Mac itself.
>> 
>> Never tried, I generally work from home. If I'm out, it's faster to tether 
>> to my 4G service rather than any public wi-fi.
>> 
>> Mark.
> 
> 
> -- 
> 
> J. Hellenthal
> 
> The fact that there's a highway to Hell but only a stairway to Heaven says a 
> lot about anticipated traffic volume.
> 
> 
> 
> 
> 
> 


-- 

J. Hellenthal

The fact that there's a highway to Hell but only a stairway to Heaven says a 
lot about anticipated traffic volume.






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