Hi Doug,
The Tcp at sender end relies on incoming acks for two major purposes :
1). Reliable delivery at receiver
If the hub sends an ack to sender, the sender end interprets that the
packet has reached the receiver, though it could have been lost over the
satellite link. So, it would actually mis-interpret the ack and would not
attempt to recover the lost packet
2). RTT calculations
The sender TCP depends upon the incoming ack to calculate the RTT
values. An ack from the hub would lead to a wrong calculation of RTT,
which in turn would cause a whole lot of other problems.
ketan
Ketan Bajaj
(M.Tech student)
Deptt. of Computer Sci. & Engg.
Indian Institute of Technology,
New Delhi
On Sat, 31 Oct 1998, Doug Dillon wrote:
>
> I'd be interested to know what semantics are lost
> by intermediate acknowledgements. When I look at the
> WinSock socket interface, I don't get any notice after I do a send
> of whether the data I sent actually arrived. This has to happen
> (I think) at the application layer.
>
> Doug.............
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