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

Dan Halperin dan at
Fri Dec 4 21:34:19 UTC 2020

FWIW, in this really interesting read
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.


On Sun, Nov 22, 2020 at 2:30 PM dc at <dc at>

> On 22 Nov 2020, at 20:43, J. Hellenthal <jhellenthal at> 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 at wrote:
> On 22 Nov 2020, at 10:17, Mark Tinka <mark.tinka at> 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-.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <>

More information about the NANOG mailing list