[Cake] Anybody has contacts at Dropbox?

[Sebastian Moeller]

Hi Jonathan,


> On Jun 25, 2023, at 01:04, Jonathan Morton <chromatix99 at gmail.com> wrote:
> 
>> On 25 Jun, 2023, at 12:00 am, Sebastian Moeller via Cake <cake at 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