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Code Editor : c1037.html

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd">
<HTML
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>Statistical Breakdowns</TITLE
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><DIV
CLASS="CHAPTER"
><H1
><A
NAME="STATBREAKDOWNS"
></A
>Chapter 5. Statistical Breakdowns</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"
>5.1. Packet Sizes</A
></H1
><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="AEN1044"
></A
><P
><B
>Figure 5-1. The packet size statistical breakdown</B
></P
><P
><IMG
SRC="iptraf-pktsize"></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-ng'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 <SAMP
CLASS="COMPUTEROUTPUT"
>-z</SAMP
> iface
  parameter. The interface parameter is required. For example,
  this command runs the facility on interface <TT
CLASS="FILENAME"
>eth0</TT
>.</P
><PRE
CLASS="SYNOPSIS"
>iptraf-ng -z eth0</PRE
><P
>  When started from the command line, the log filename and log interval can be
  specified with the <SAMP
CLASS="COMPUTEROUTPUT"
>-L</SAMP
> and <SAMP
CLASS="COMPUTEROUTPUT"
>-I</SAMP
>
  parameters respectively.  See the <A
HREF="x171.html"
>Command-line Parameters</A
>
  section above for more information.</P
><P
>  To exit, press X or Ctrl+X.</P
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>TCP and UDP Traffic Statistics</TD
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>

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Code Editor : c1037.html