Ethereal-users: Re: [Ethereal-users] Re: Plotting TCP Congetion Window evolution

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From: Guy Harris <gharris@xxxxxxxxx>
Date: Tue, 15 Nov 2005 02:29:26 -0800
Andersen Jens Elmo wrote:


The TCP window size is present in every single TCP packet.
Yes, but the *congestion* window isn't - it's a state variable inside the TCP stack, which is used to limit the amount of data transmitted to a value possibly lower than the size of the TCP window offered to the transmitter by the receiver; see RFC 2581: 

	http://www.ietf.org/rfc/rfc2581.txt

and the documents to which it refers (such as Van Jacobson's two papers).