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<html><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><!--Converted with jLaTeX2HTML 2002 (1.62) JA patch-1.4patched version by: Kenshi Muto, Debian Project.LaTeX2HTML 2002 (1.62),original version by: Nikos Drakos, CBLU, University of Leeds* revised and updated by: Marcus Hennecke, Ross Moore, Herb Swan* with significant contributions from: Jens Lippmann, Marek Rouchal, Martin Wilck and others --><HTML><HEAD><TITLE>31.1.4 Other Configuration Parameters</TITLE><META NAME="description" CONTENT="31.1.4 Other Configuration Parameters"><META NAME="keywords" CONTENT="everything"><META NAME="resource-type" CONTENT="document"><META NAME="distribution" CONTENT="global"><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"><META NAME="Generator" CONTENT="jLaTeX2HTML v2002 JA patch-1.4"><META HTTP-EQUIV="Content-Style-Type" CONTENT="text/css"><LINK REL="STYLESHEET" HREF="everything.css" tppabs="http://www.isi.edu/nsnam/ns/doc/everything.css"><LINK REL="next" HREF="node374.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node374.html"><LINK REL="previous" HREF="node370.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node370.html"><LINK REL="up" HREF="node365.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node365.html"><LINK REL="next" HREF="node374.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node374.html"></HEAD><BODY ><!--Navigation Panel--><A NAME="tex2html7136" HREF="node374.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node374.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html7130" HREF="node365.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node365.html"><IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="file:/usr/share/latex2html/icons/up.png"></A> <A NAME="tex2html7124" HREF="node372.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node372.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html7132" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html"><IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="file:/usr/share/latex2html/icons/contents.png"></A> <A NAME="tex2html7134" HREF="node590.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node590.html"><IMG WIDTH="43" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="index" SRC="file:/usr/share/latex2html/icons/index.png"></A> <BR><B> Next:</B> <A NAME="tex2html7137" HREF="node374.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node374.html">31.1.5 Other One-Way TCP</A><B> Up:</B> <A NAME="tex2html7131" HREF="node365.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node365.html">31.1 One-Way TCP Senders</A><B> Previous:</B> <A NAME="tex2html7125" HREF="node372.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node372.html">31.1.3.0.2 TCP Data Source</A>   <B> <A NAME="tex2html7133" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html7135" HREF="node590.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node590.html">Index</A></B> <BR><BR><!--End of Navigation Panel--><H2><A NAME="SECTION06214000000000000000"></A><A NAME="sec:other-tcp-config"></A><BR>31.1.4 Other Configuration Parameters</H2><P>In addition to the <TT>window_</TT> parameter listed above,the TCP agent supports additional configuration variables.Each of the variables described in this subsection isboth a class variable and an instance variable.Changing the class variable changes the default valuefor all agents that are created subsequently.Changing the instance variable of a particular agentonly affects the values used by that agent.For example,<PRE> Agent/TCP set window_ 100 # Changes the class variable; $tcp set window_ 2.0 # Changes window_ for the $tcp object only;</PRE><P>The default parameters for each TCP agent are:<PRE>Agent/TCP set window_ 20 # max bound on window size;Agent/TCP set windowInit_ 1 # initial/reset value of cwnd;Agent/TCP set windowOption_ 1 # cong avoid algorithm (1: standard);Agent/TCP set windowConstant_ 4 # used only when windowOption != 1;Agent/TCP set windowThresh_ 0.002 # used in computing averaged window;Agent/TCP set overhead_ 0 # !=0 adds random time between sends;Agent/TCP set ecn_ 0 # TCP should react to ecn bit ;Agent/TCP set packetSize_ 1000 # packet size used by sender (bytes);Agent/TCP set bugFix_ true # see explanation;Agent/TCP set slow_start_restart_ true # see explanation;Agent/TCP set tcpTick_ 0.1 # timer granulatiry in sec (.1 is NONSTANDARD);Agent/TCP set maxrto_ 64 # bound on RTO (seconds);Agent/TCP set dupacks_ 0 # duplicate ACK counter;Agent/TCP set ack_ 0 # highest ACK received;Agent/TCP set cwnd_ 0 # congestion window (packets);Agent/TCP set awnd_ 0 # averaged cwnd (experimental);Agent/TCP set ssthresh_ 0 # slow-stat threshold (packets);Agent/TCP set rtt_ 0 # rtt sample;Agent/TCP set srtt_ 0 # smoothed (averaged) rtt;Agent/TCP set rttvar_ 0 # mean deviation of rtt samples;Agent/TCP set backoff_ 0 # current RTO backoff factor;Agent/TCP set maxseq_ 0 # max (packet) seq number sent;</PRE><P>For many simulations, few of the configuration parameters are likelyto require modification.The more commonly modified parameters include: <TT>window_</TT> and<TT>packetSize_</TT>.The first of these bounds the window TCP uses, and is consideredto play the role of the receiver's advertised window in real-worldTCP (although it remains constant).The packet size essentially functions like the MSS size in real-worldTCP.Changes to these parameters can have a profound effect on the behaviorof TCP.Generally, those TCPs with larger packet sizes, bigger windows, andsmaller round trip times (a result of the topology and congestion) aremore agressive in acquiring network bandwidth.<P><HR><!--Navigation Panel--><A NAME="tex2html7136" HREF="node374.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node374.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html7130" HREF="node365.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node365.html"><IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="file:/usr/share/latex2html/icons/up.png"></A> <A NAME="tex2html7124" HREF="node372.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node372.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html7132" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html"><IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="file:/usr/share/latex2html/icons/contents.png"></A> <A NAME="tex2html7134" HREF="node590.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node590.html"><IMG WIDTH="43" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="index" SRC="file:/usr/share/latex2html/icons/index.png"></A> <BR><B> Next:</B> <A NAME="tex2html7137" HREF="node374.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node374.html">31.1.5 Other One-Way TCP</A><B> Up:</B> <A NAME="tex2html7131" HREF="node365.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node365.html">31.1 One-Way TCP Senders</A><B> Previous:</B> <A NAME="tex2html7125" HREF="node372.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node372.html">31.1.3.0.2 TCP Data Source</A>   <B> <A NAME="tex2html7133" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html7135" HREF="node590.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node590.html">Index</A></B> <!--End of Navigation Panel--><ADDRESS>2003-09-23</ADDRESS></BODY></HTML>⌨️ 快捷键说明
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