Right, I am speaking of the process between end stations here. My thinking
is, if the router discarded the frame, then the originating station would
not get an ack out of sequence from the remote end station because the
packet was dropped (therefore the remote never got something to ack).
The originating station would actually retransmit because it did not get an
ack from the remote.
Right?
Unless TCP has negotiated that x number of packets can be transmitted w/o
an ack. Which I know can be done, but don't know how common it is.
-----Original Message-----
From: Howard C. Berkowitz [mailto:[EMAIL PROTECTED]]
Sent: Friday, February 09, 2001 10:06 AM
To: [EMAIL PROTECTED]
Subject: RE: not quite sure...
>In the discussion of error correction, I think an error on my part has been
>missed. I was thinking about it and I wonder if this is entirely accurate:
>
>(concerning what happens after a frame is discarded on WAN link)
>
>"The end station will respond by acking the next packet it recieves with
the
>appriopriate (lower numbered) sequence number (of the missed packet). The
>originating station will
>get this ack (with the lower sequence number) see that the end station is
>requesting a packet out of sequence and the originating station will begin
>it's next transmission with the data from that particular sequence number."
>
>Is this correct?
Emphasis: end station. You are describing what TCP does. Routers
typically are unconcerned with TCP.
And again, not all applications need reliable links, so not all
applications will have retransmission ANYWHERE in the path.
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