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"RFC 4782 Quick-Start for TCP and IP"
S. Floyd, M. Allman, A. Jain, and P. Sarolahti
Request For Comments 4782
January 2007
PDF
Overview:
This document specifies an optional Quick-Start mechanism for
transport protocols, in cooperation with routers, to determine an
allowed sending rate at the start and, at times, in the middle of a
data transfer (e.g., after an idle period). While Quick-Start is
designed to be used by a range of transport protocols, in this
document we only specify its use with TCP. Quick-Start is designed
to allow connections to use higher sending rates when there is
significant unused bandwidth along the path, and the sender and all
of the routers along the path approve the Quick-Start Request.
This document describes many paths where Quick-Start Requests would
not be approved. These paths include all paths containing routers,
IP tunnels, MPLS paths, and the like that do not support Quick-
Start. These paths also include paths with routers or middleboxes
that drop packets containing IP options. Quick-Start Requests could
be difficult to approve over paths that include multi-access layer-
two networks. This document also describes environments where the
Quick-Start process could fail with false positives, with the sender
incorrectly assuming that the Quick-Start Request had been approved
by all of the routers along the path. As a result of these
concerns, and as a result of the difficulties and seeming absence of
motivation for routers, such as core routers to deploy Quick-Start,
Quick-Start is being proposed as a mechanism that could be of use in
controlled environments, and not as a mechanism that would be
intended or appropriate for ubiquitous deployment in the global
Internet. This memo defines an Experimental Protocol for the Internet
community.
Note: the .pdf link actually goes to a .txt file for this paper.
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