I-D ACTION:draft-amit-quick-start-02.txt,.ps

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	Title		: Quick-Start for TCP and IP
	Author(s)	: A. Jain, S. Floyd
	Filename	: draft-amit-quick-start-02.txt,.ps
	Pages		: 21
	Date		: 2002-11-6
	
This draft outlines an optional Quick-Start mechanism for transport
protocols to determine an optional allowed initial congestion window
or initial sending rate at the start of a data transfer.  This
mechanism is designed to be used by a range of transport protocols;
however, in this document we only describe its use with TCP and IPv4.
By using Quick-Start, a TCP host, say, host A, would indicate its
desired initial sending rate in packets per second in a Quick Start
Request option in the IP header of the initial TCP SYN or SYN/ACK
packet. Each router in turn could either approve the specified
initial rate, reduce the specified initial rate, or indicate that
nothing above the default initial rate for that protocol would be
allowed.  The Quick-Start mechanism also can determine if there are
routers along the path that do not understand the Quick Start Request
option, or have not agreed to the initial rate described in the
option.  TCP host B communicates the final initial rate to TCP host A
in a transport-level Quick-Start Response in the answering SYN/ACK or
ACK packet.  Quick-Start is designed to allow TCP connections to use
high initial windows in circumstances when there is significant
unused bandwidth along the path, and all of the routers along the
path support the Quick-Start Request.  This proposal is a request for
feedback from the community.

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