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A client-side split-ACK tool for TCP Slow Start investigation

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2 Author(s)
Michael Welzl ; Dept. of Inf., Univ. of Oslo, Oslo, Norway ; Normann, R.E.

TCP's Slow Start phase has recently gotten much attention because Google proposes to use a larger starting point (Initial Window, IW). For their large-scale measurement study, they have applied a change to their well-connected web server; how the larger IW would affect other servers, or hosts that would use it to send data across a low-bandwidth or wireless connection, is less understood. We present a tool that, by splitting ACKs into multiple pieces at the beginning of a connection, can be used to trick a host into sending a larger number of packets than normally intended within one RTT in Slow Start. Test results indicate that, while many hosts do not react to our tool, some do - probably enough to use the tool for measurements.

Published in:

Computing, Networking and Communications (ICNC), 2012 International Conference on

Date of Conference:

Jan. 30 2012-Feb. 2 2012