Re: Apple Catalina Appears to Introduce Massive Jitter - SOLVED! - Update!

[Dan Halperin via NANOG <nanog () nanog org>]

FWIW, in this really interesting read
<https://googleprojectzero.blogspot.com/2020/12/an-ios-zero-click-radio-proximity.html>
about
the latest vulnerability released by Project Zero, they talk about AWDL and
how if this is in use (AirDrop enabled?) then you're going to get tons of
jitter/packet loss.

In this way [TDM hopping between Wi-Fi Access Point and AWDL Mesh] the
> device can appear to be connected to the access point whilst also
> participating in the AWDL mesh at the same time. Of course, frames might be
> missed from both the AP and the AWDL mesh but the protocols are treating
> radio as an unreliable transport anyway so this only really has an impact
> on throughput. A large part of the AWDL protocol involves trying to
> synchronize the channel switching between peers to improve throughput.


Dan

On Sun, Nov 22, 2020 at 2:30 PM dc () darwincosta com <dc () darwincosta com>
wrote:

> On 22 Nov 2020, at 20:43, J. Hellenthal <jhellenthal () dataix net> wrote:
>
> You can supposedly still use 4.5 4.6 on Big Sur if you do the following
> but I have not tested it on Little Snotch, works fine for personal software
> and others ...
>
> codesign -dvvv littlesnitch.package name
> Save the team identifier
> Boot into recovery mode
> Open terminal and type the following...
> spctl kext-consent add <team identifier>
> Reboot into normal user mode and install version 4
>
> Thanks for the hint. Will have a look into it.
>
>
>
>
> --
>  J. Hellenthal
>
> The fact that there's a highway to Hell but only a stairway to Heaven says
> a lot about anticipated traffic volume.
>
> On Nov 22, 2020, at 11:55, dc () darwincosta com wrote:
>
> 
>
> On 22 Nov 2020, at 10:17, Mark Tinka <mark.tinka () seacom com> wrote:
>
>  So after installing Little Snitch and basically denying "trustd" any
> kind of Internet access, I have been seeing reasonably normal jitter with
> Bluetooth enabled.
>
> I actually “saw the same” on Catalina while using little snitch.
>
> “Saw the same” after installing yesterday Big Sur and suddenly received a
> notification “this version of little snitch is no longer supported by
> macOS. It’s looks like I have to pay 25€ for a new compatible version.
>
>
> It's not that Bluetooth stops scanning, but it's not scanning as
> aggressively. So after a few minutes, there will be very high jitter when
> Bluetooth scans the environment, but it would affect only a single packet.
> It's easily reduced its chattiness by 99%.
>
> I don't have any empirical data to support the claim that Little Snitch
> has anything to do with it (and I am too lazy to dig further into it), but
> the reduction in jitter is massively noticeable since Little Snitch. Which
> means I can now run Catalina with Bluetooth enabled and not have any wi-fi
> problems.
>
> Just FYI, for the archives :-).
>
> Mark.
>
> Cheers,
> Darwin-.