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><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="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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