<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"> <HTML ><HEAD ><TITLE >Statistical Breakdowns</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.64 "><LINK REL="HOME" TITLE="IPTraf User's Manual" HREF="manual.html"><LINK REL="PREVIOUS" TITLE="Detailed Interface Statistics" HREF="detstats.html"><LINK REL="NEXT" TITLE="TCP and UDP Traffic Statistics" HREF="servmon.html"></HEAD ><BODY CLASS="CHAPTER" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >IPTraf User's Manual</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="detstats.html" ><<< Previous</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="servmon.html" >Next >>></A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="CHAPTER" ><H1 ><A NAME="STATBREAKDOWNS" >Statistical Breakdowns</A ></H1 ><P > Statistical breakdowns contain two facilities that break down traffic counts by either packet size or TCP/UDP port.</P ><DIV CLASS="SECT1" ><H1 CLASS="SECT1" ><A NAME="PKTSIZE" >Packet Sizes</A ></H1 ><P > The packet size breakdown facility used to be incorporated into the detailed interface statistics. It has since been moved to its own facility. It is entered by selecting <I CLASS="EMPHASIS" >Statistical Breakdowns/By packet size</I >.</P ><P > The packet size breakdown takes the interface's Maximum Transmission Unit (MTU) size and divides it into 20 brackets, each bracket containing a range of sizes. As a packet is captured, its size is determined and the appropriate bracket is incremented.</P ><P > This facility provides an idea as to the packet sizes passing over your network, and can aid in network (re)design decisions.</P ><DIV CLASS="FIGURE" ><A NAME="AEN1146" ></A ><P ><IMG SRC="iptraf-pktsize.png"></P ><P ><B >Figure 1. The packet size statistical breakdown</B ></P ></DIV ><P > If logging is enabled, copies of the statistics are written at regular intervals to a log file. The default log file name is <TT CLASS="FILENAME" >packet_size-<TT CLASS="REPLACEABLE" ><I >iface</I ></TT >.log</TT > where <TT CLASS="REPLACEABLE" ><I >iface</I ></TT > is the selected interface for this session (for example, <TT CLASS="FILENAME" >packet_size-eth0.log</TT >).</P ><P >IPTraf's filters do not affect this facility.</P ><P > The packet size breakdown can also be invoked straight from the command line by specifying the <TT CLASS="COMPUTEROUTPUT" >-z</TT > iface parameter. The interface parameter is required. For example, this command runs the facility on interface <TT CLASS="FILENAME" >eth0</TT >.</P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><PRE CLASS="SYNOPSIS" >iptraf -z eth0</PRE ></TD ></TR ></TABLE ><P > To exit, press X or Ctrl+X.</P ></DIV ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="detstats.html" ><<< Previous</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="manual.html" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="servmon.html" >Next >>></A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Detailed Interface Statistics</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" > </TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >TCP and UDP Traffic Statistics</TD ></TR ></TABLE ></DIV ></BODY ></HTML >
