Ongoing TCP Research Related to Satellites
RFC 2760
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RFC - Informational
(February 2000; No errata)
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Last updated |
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2013-03-02
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IETF
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RFC 2760 (Informational)
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Network Working Group M. Allman, Editor
Request for Comments: 2760 NASA Glenn Research Center/BBN Technologies
Category: Informational S. Dawkins
Nortel
D. Glover
J. Griner
D. Tran
NASA Glenn Research Center
T. Henderson
University of California at Berkeley
J. Heidemann
J. Touch
University of Southern California/ISI
H. Kruse
S. Ostermann
Ohio University
K. Scott
The MITRE Corporation
J. Semke
Pittsburgh Supercomputing Center
February 2000
Ongoing TCP Research Related to Satellites
Status of this Memo
This memo provides information for the Internet community. It does
not specify an Internet standard of any kind. Distribution of this
memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2000). All Rights Reserved.
Abstract
This document outlines possible TCP enhancements that may allow TCP
to better utilize the available bandwidth provided by networks
containing satellite links. The algorithms and mechanisms outlined
have not been judged to be mature enough to be recommended by the
IETF. The goal of this document is to educate researchers as to the
current work and progress being done in TCP research related to
satellite networks.
Allman, et al. Informational [Page 1]
RFC 2760 Ongoing TCP Research Related to Satellites February 2000
Table of Contents
1 Introduction. . . . . . . . . . . . . . . . . . . . 2
2 Satellite Architectures . . . . . . . . . . . . . . 3
2.1 Asymmetric Satellite Networks . . . . . . . . . . . 3
2.2 Satellite Link as Last Hop. . . . . . . . . . . . . 3
2.3 Hybrid Satellite Networks . . . . . . . . . . . 4
2.4 Point-to-Point Satellite Networks . . . . . . . . . 4
2.5 Multiple Satellite Hops . . . . . . . . . . . . . . 4
3 Mitigations . . . . . . . . . . . . . . . . . . . . 4
3.1 TCP For Transactions. . . . . . . . . . . . . . . . 4
3.2 Slow Start. . . . . . . . . . . . . . . . . . . . . 5
3.2.1 Larger Initial Window . . . . . . . . . . . . . . . 6
3.2.2 Byte Counting . . . . . . . . . . . . . . . . . . . 7
3.2.3 Delayed ACKs After Slow Start . . . . . . . . . . . 9
3.2.4 Terminating Slow Start. . . . . . . . . . . . . . . 11
3.3 Loss Recovery . . . . . . . . . . . . . . . . . . . 12
3.3.1 Non-SACK Based Mechanisms . . . . . . . . . . . . . 12
3.3.2 SACK Based Mechanisms . . . . . . . . . . . . . . . 13
3.3.3 Explicit Congestion Notification. . . . . . . . . . 16
3.3.4 Detecting Corruption Loss . . . . . . . . . . . . . 18
3.4 Congestion Avoidance. . . . . . . . . . . . . . . . 21
3.5 Multiple Data Connections . . . . . . . . . . . . . 22
3.6 Pacing TCP Segments . . . . . . . . . . . . . . . . 24
3.7 TCP Header Compression. . . . . . . . . . . . . . . 26
3.8 Sharing TCP State Among Similar Connections . . . . 29
3.9 ACK Congestion Control. . . . . . . . . . . . . . . 32
3.10 ACK Filtering . . . . . . . . . . . . . . . . . . . 34
4 Conclusions . . . . . . . . . . . . . . . . . . . . 36
5 Security Considerations . . . . . . . . . . . . . . 36
6 Acknowledgments . . . . . . . . . . . . . . . . . . 37
7 References. . . . . . . . . . . . . . . . . . . . . 37
8 Authors' Addresses. . . . . . . . . . . . . . . . . 43
9 Full Copyright Statement. . . . . . . . . . . . . . 46
1 Introduction
This document outlines mechanisms that may help the Transmission
Control Protocol (TCP) [Pos81] better utilize the bandwidth provided
by long-delay satellite environments. These mechanisms may also help
in other environments or for other protocols. The proposals outlined
in this document are currently being studied throughout the research
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