Re: [Bloat] [Cake] Anybody has contacts at Dropbox?

[Sebastian Moeller via Bloat]

Hi Jonathan,


> On Jun 25, 2023, at 01:04, Jonathan Morton  wrote:
> 
>> On 25 Jun, 2023, at 12:00 am, Sebastian Moeller via Cake 
>>  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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Re: [Bloat] [Cake] Anybody has contacts at Dropbox?

[Jonathan Morton via Bloat]

> On 25 Jun, 2023, at 12:00 am, Sebastian Moeller via Cake 
>  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.  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.

 - Jonathan Morton
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