Hi Jonathan,
> On Jun 25, 2023, at 01:04, Jonathan Morton <chromati...@gmail.com> wrote:
>
>> On 25 Jun, 2023, at 12:00 am, Sebastian Moeller via Cake
>> <c...@lists.bufferbloat.net> wrote:
>>
>> Is dropbox silently already using an L4S-style CC for their TCP?
>
> It should be possible to distinguish this by looking at the three-way
> handshake at the start of the connection.
[SM] Great idea, just need to google how to restart the dropbox client
to force a new handshake.
> This will show a different set of TCP flags and ECN field values depending
> on whether RFC-3168 or AccECN is being attempted. Without AccECN, you won't
> have functioning L4S on a TCP stream.
>
> But I think it is more likely that it's a misapplied DSCP.
[SM] Probably...
Thanks & Best Regards
Sebastian
>
> - Jonathan Morton
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