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><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="AEN1187"
></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
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>iptraf -z eth0</PRE
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>  When started from the command line, the log filename and log interval can be
  specified with the <TT
CLASS="COMPUTEROUTPUT"
>-L</TT
> and <TT
CLASS="COMPUTEROUTPUT"
>-I</TT
>
  parameters respectively.  See the <A
HREF="cmdline.html"
>Command-line Parameters</A
>
  section above for more information.</P
><P
>  To exit, press X or Ctrl+X.</P
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