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Versions: 00 rfc3042                                     Standards Track
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        RFC 3042

        Title:      Enhancing TCP's Loss Recovery Using Limited
                    Transmit
        Author(s):  M. Allman, H. Balakrishnan, S. Floyd
        Status:     Standards Track
        Date:       January 2001
        Mailbox:    mallman@grc.nasa.gov, hari@lcs.mit.edu,
                    floyd@aciri.org
        Pages:      9
        Characters: 19885
        Updates/Obsoletes/SeeAlso:  None

        I-D Tag:    draft-ietf-tsvwg-limited-xmit-00.txt

        URL:        ftp://ftp.rfc-editor.org/in-notes/rfc3042.txt


This document proposes a new Transmission Control Protocol (TCP)
mechanism that can be used to more effectively recover lost segments
when a connection's congestion window is small, or when a large number
of segments are lost in a single transmission window.  The "Limited
Transmit" algorithm calls for sending a new data segment in response
to each of the first two duplicate acknowledgments that arrive at the
sender.  Transmitting these segments increases the probability that
TCP can recover from a single lost segment using the fast retransmit
algorithm, rather than using a costly retransmission timeout.  Limited
Transmit can be used both in conjunction with, and in the absence of,
the TCP selective acknowledgment (SACK) mechanism.

This document is a product of the Transport Area Working Group of the
IETF.

This is now a Proposed Standard Protocol.

This document specifies an Internet standards track protocol for
the Internet community, and requests discussion and suggestions
for improvements.  Please refer to the current edition of the
"Internet Official Protocol Standards" (STD 1) for the
standardization state and status of this protocol.  Distribution
of this memo is unlimited.

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