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.
