[rfc-dist] RFC 4782 on Quick-Start for TCP and IP
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Mon Jan 29 16:48:40 PST 2007
A new Request for Comments is now available in online RFC libraries.
Title: Quick-Start for TCP and IP
Author: S. Floyd, M. Allman,
A. Jain, P. Sarolahti
Date: January 2007
Mailbox: floyd at icir.org,
mallman at icir.org,
a.jain at f5.com, pasi.sarolahti at iki.fi
I-D Tag: draft-ietf-tsvwg-quickstart-07.txt
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
This document is a product of the Transport Area Working Group
Working Group of the IETF.
EXPERIMENTAL: This memo defines an Experimental Protocol for the Internet
community. It does not specify an Internet standard of any kind.
Discussion and suggestions for improvement are requested. Distribution
of this memo is unlimited.
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