[Make-wifi-fast] Fwd: Re: [iccrg] TCP behavior across WiFi pointers ?

Simon Barber simon at superduper.net
Thu Nov 30 17:35:33 EST 2017

This was our assumption (client = endpoint, 802.11 ACK = TCP delivery), but we discovered that this is not always the case, even where the client is the endpoint. FastACK keeps the data around and retransmits it in this case.


> On Nov 30, 2017, at 12:52 AM, Toke Høiland-Jørgensen <toke at toke.dk> wrote:
> Jonathan Morton <chromatix99 at gmail.com> writes:
>> A hint, but not a guarantee.  If you generate a fake ack, you'd better be
>> prepared to retransmit the packet if, in fact, it gets lost deeper in the
>> network.
> I think their use case here is an AP that (they presume) is talking
> directly to the client. In which case it's probably a fair assumption...
> Most operating systems don't drop packets between the WiFi card and the
> TCP stack :)
> Of course, a client may be forwarding the packet somewhere, in which
> case this would probably break in interesting ways...
> -Toke
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