[e2e] Some questions about TCP.

David P. Reed dpreed at reed.com
Sun Nov 22 13:45:57 PST 2009

On 11/22/2009 02:04 PM, Detlef Bosau wrote:
> 1.: Recently, I was told, however I did not find a reference in some 
> RFC, we had two distinct packet types in TCP:
> - those _with_ payload, which are _data_ _segments_,
> - those _without_ payload, which are _acknowledgements_.
Not true.   TCP was designed to piggyback acknowledgements with data.  
Acknowledgements are reflected only as increases in sequence numbers.   
One can think of the arrival of a packet with a sequence number larger 
than any previous sequence number as a "virtual" acknowledgement message.

I am curious who told you that "fact".

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