draft-ietf-tsvwg-initwin-01.txt   draft-ietf-tsvwg-initwin-02.txt 
Internet Engineering Task Force Mark Allman Internet Engineering Task Force Mark Allman
INTERNET DRAFT BBN/NASA GRC INTERNET DRAFT BBN/NASA GRC
File: draft-ietf-tsvwg-initwin-01.txt February, 2002 File: draft-ietf-tsvwg-initwin-02.txt March, 2002
Expires: August, 2002 Expires: September, 2002
Sally Floyd Sally Floyd
ICIR ICIR
Craig Partridge Craig Partridge
BBN Technologies BBN Technologies
Increasing TCP's Initial Window Increasing TCP's Initial Window
Status of this Memo Status of this Memo
This document is an Internet-Draft and is in full conformance with This document is an Internet-Draft and is in full conformance with
skipping to change at page 2, line 18 skipping to change at page 2, line 18
on the maximum segment size (MSS), as follows: on the maximum segment size (MSS), as follows:
If (MSS <= 1095 bytes) If (MSS <= 1095 bytes)
then win <= 4 * MSS; then win <= 4 * MSS;
If (1095 bytes < MSS < 2190 bytes) If (1095 bytes < MSS < 2190 bytes)
then win <= 4380; then win <= 4380;
If (2190 bytes <= MSS) If (2190 bytes <= MSS)
then win <= 2 * MSS; then win <= 2 * MSS;
This increased initial window is optional: that a TCP MAY start with This increased initial window is optional: that a TCP MAY start with
a larger initial window, not that it SHOULD. a larger initial window. However, we expect that most
general-purpose TCP implementations would choose to use the larger
initial congestion window given in equation (1) above.
This upper bound for the initial window size represents a change This upper bound for the initial window size represents a change
from RFC 2581 [RFC2581], which specified that the congestion window from RFC 2581 [RFC2581], which specified that the congestion window
be initialized to one or two segments. be initialized to one or two segments.
This change applies to the initial window of the connection in the This change applies to the initial window of the connection in the
first round trip time (RTT) of data transmission following the TCP three- first round trip time (RTT) of data transmission following the TCP three-
way handshake. Neither the SYN/ACK nor its acknowledgment (ACK) in way handshake. Neither the SYN/ACK nor its acknowledgment (ACK) in
the three-way handshake should increase the initial window size the three-way handshake should increase the initial window size
above that outlined in equation (1). If the SYN or SYN/ACK is lost, above that outlined in equation (1). If the SYN or SYN/ACK is lost,
 End of changes. 

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