TCP Zero Window Advertisement.

[hiren panchasara]

On 07/18/17 at 11:28P, KVK Singh wrote:
> Hi,
> 
> By going through the Zero Window advertisement concept What I found is that
> if sender has transmitted packet 2,3,4,5,6,7  i.e packet from 2-7 total  6
> packets in flight then By chance if sender received a Zero Window
> Advertisement (ZWA) for segment 4 then it does not enters in probe
> mode/ persistent
> state. However if it receive ZWA for 7 i.e last packet in flight then it
> enters in Probe mode/ persistent state and it starts probing for window
> update.

Can you please site/explain how you got to this conclusion? Did you find
FreeBSD or any other implementation doing this?
> 
> Is that the behavior is correct Because as going through the paper and RFC
> I find that any segment can be acked with ZWA and sender will enter in
> persist mode once it receive the ZWA.

I thought this is how its supposed to work. I may be mis-remembering.

Cheers,
Hiren
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