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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>35.5 Applications objects</TITLE><META NAME="description" CONTENT="35.5 Applications objects"><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="node489.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node489.html"><LINK REL="previous" HREF="node485.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node485.html"><LINK REL="up" HREF="node471.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node471.html"><LINK REL="next" HREF="node489.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node489.html"></HEAD><BODY ><!--Navigation Panel--><A NAME="tex2html8903" HREF="node489.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node489.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html8897" HREF="node471.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node471.html"><IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="file:/usr/share/latex2html/icons/up.png"></A> <A NAME="tex2html8891" HREF="node487.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node487.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html8899" 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="tex2html8901" 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="tex2html8904" HREF="node489.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node489.html">35.6 Commands at a</A><B> Up:</B> <A NAME="tex2html8898" HREF="node471.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node471.html">35. Applications and transport</A><B> Previous:</B> <A NAME="tex2html8892" HREF="node487.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node487.html">35.4.0.0.2 Application/Telnet</A>   <B> <A NAME="tex2html8900" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html8902" HREF="node590.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node590.html">Index</A></B> <BR><BR><!--End of Navigation Panel--><H1><A NAME="SECTION07150000000000000000"></A> <A NAME="sec:appobjects"></A><BR>35.5 Applications objects</H1> An application object may be of two types, a traffic generator or asimulated application. Traffic generator objects generate traffic and canbe of four types, namely, exponential, pareto, CBR and traffic trace. <DL><DT><STRONG>Application/Traffic/Exponential objects</STRONG></DT><DD>Exponential traffic objects generate On/Off traffic. During "on" periods,packets are generated at a constant burst rate. During "off" periods, notraffic is generated. Burst times and idle times are taken fromexponential distributions. Configuration parameters are: <DL><DT><STRONG>PacketSize_</STRONG></DT><DD>constant size of packets generated.</DD><DT><STRONG>burst_time_</STRONG></DT><DD>average on time for generator. </DD><DT><STRONG>idle_time_</STRONG></DT><DD>average off time for generator. </DD><DT><STRONG>rate_</STRONG></DT><DD>sending rate during on time. </DD></DL><P></DD><DT><STRONG>Application/Traffic/Pareto</STRONG></DT><DD>Application/Traffic/Pareto objects generate On/Off traffic with bursttimes and idle times taken from pareto distributions. Configurationparameters are:<DL><DT><STRONG>PacketSize_</STRONG></DT><DD>constant size of packets generated.</DD><DT><STRONG>burst_time_</STRONG></DT><DD>average on time for generator.</DD><DT><STRONG>idle_time_</STRONG></DT><DD>average off time for generator.</DD><DT><STRONG>rate_</STRONG></DT><DD>sending rate during on time.</DD><DT><STRONG>shape_</STRONG></DT><DD>the shape parameter used by pareto distribution.</DD></DL><P></DD><DT><STRONG>Application/Traffic/CBR</STRONG></DT><DD>CBR objects generate packets at a constant bit rate. <P><TT>$cbr start</TT><BR>Causes the source to start generating packets. <P><TT>$cbr stop</TT><BR>Causes the source to stop generating packets. <P>Configuration parameters are:<DL><DT><STRONG>PacketSize_</STRONG></DT><DD>constant size of packets generated. </DD><DT><STRONG>rate_</STRONG></DT><DD>sending rate.</DD><DT><STRONG>interval_</STRONG></DT><DD>(optional) interval between packets.</DD><DT><STRONG>random_</STRONG></DT><DD>whether or not to introduce random noise in the scheduleddeparture times. defualt is off.</DD><DT><STRONG>maxpkts_</STRONG></DT><DD>maximum number of packets to send.</DD></DL><P></DD><DT><STRONG>Application/Traffic/Trace</STRONG></DT><DD>Application/Traffic/Trace objects are used to generate traffic from atrace file. <TT>$trace attach-tracefile tfile</TT><BR>Attach the Tracefile object tfile to this trace. The Tracefile objectspecifies the trace file from which the traffic data is to be read.Multiple Application/Traffic/Trace objects can be attachedto the same Tracefile object. A random starting place within the Tracefileis chosen for each Application/Traffic/Trace object. <BR><P>There are no configuration parameters for this object. </DD></DL><P>A simulated application object can be of two types, Telnet and FTP.<DL><DT><STRONG>Application/Telnet</STRONG></DT><DD>TELNET objects produce individual packets with inter-arrival times asfollows. If interval_ is non-zero, then inter-arrival times are chosenfrom an exponential distribution with average interval_. If interval_ iszero, then inter-arrival times are chosen using the "tcplib" telnetdistribution. <P><TT>$telnet start</TT><BR>Causes the Application/Telnet object to start producing packets. <P><TT>$telnet stop</TT><BR>Causes the Application/Telnet object to stop producing packets. <P><TT>$telnet attach agent</TT><BR>Attaches a Telnet object to agent. <P>Configuration Parameters are:<DL><DT><STRONG>interval_</STRONG></DT><DD>The average inter-arrival time in seconds for packets generated by theTelnet object. </DD></DL><P></DD><DT><STRONG>Application FTP</STRONG></DT><DD>FTP objects produce bulk data for a TCP object to send. <P><TT>$ftp start</TT><BR>Causes the source to produce maxpkts_ packets. <P><TT>$ftp produce n</TT><BR>Causes the FTP object to produce n packets instantaneously. <P><TT>$ftp stop</TT><BR>Causes the attached TCP object to stop sending data. <P><TT>$ftp attach agent</TT><BR>Attaches a Application/FTP object to agent. <P><TT>$ftp producemore count</TT><BR>Causes the Application/FTP object to produce count more packets. <P>Configuration Parameters are:<DL><DT><STRONG>maxpkts</STRONG></DT><DD>The maximum number of packets generated by the source. </DD></DL></DD></DL><P>T<SMALL>RACEFILE OBJECTS</SMALL>Tracefile objects are used to specify the trace file that is to be usedfor generating traffic (see Application/Traffic/Trace objectsdescribed earlier in this section). <TT>$tracefile</TT> is an instance ofthe Tracefile Object. <TT>$tracefile filename trace-input</TT><BR>Set the filename from which the traffic trace data is to be read totrace-input. <P>There are no configuration parameters for this object. A trace fileconsists of any number of fixed length records. Each record consists of 232 bit fields. The first indicates the interval until the next packet isgenerated in microseconds. The second indicates the length of the nextpacket in bytes. <P><HR><!--Navigation Panel--><A NAME="tex2html8903" HREF="node489.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node489.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html8897" HREF="node471.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node471.html"><IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="file:/usr/share/latex2html/icons/up.png"></A> <A NAME="tex2html8891" HREF="node487.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node487.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html8899" 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="tex2html8901" 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="tex2html8904" HREF="node489.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node489.html">35.6 Commands at a</A><B> Up:</B> <A NAME="tex2html8898" HREF="node471.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node471.html">35. Applications and transport</A><B> Previous:</B> <A NAME="tex2html8892" HREF="node487.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node487.html">35.4.0.0.2 Application/Telnet</A>   <B> <A NAME="tex2html8900" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html8902" 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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