TCP Zero Window Advertisement.

[KVK Singh]

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.

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.

Please resolve my query.

Thanks and regards.