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><H1
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><A
NAME="DETSTATS"
>Detailed Interface Statistics</A
></H1
><P
> The third menu option displays packet statistics for any
selected interface. It provides basically the same information
as the <I
CLASS="EMPHASIS"
>General interface statistics</I
>
option, with additional details.
This facility provides the following information:</P
><P
></P
><UL
COMPACT="COMPACT"
><LI
STYLE="list-style-type: disc"
><P
> Total packet and byte counts</P
></LI
><LI
STYLE="list-style-type: disc"
><P
> IP packet and byte counts</P
></LI
><LI
STYLE="list-style-type: disc"
><P
> TCP packet and byte counts</P
></LI
><LI
STYLE="list-style-type: disc"
><P
> UDP packet and byte count</P
></LI
><LI
STYLE="list-style-type: disc"
><P
> ICMP packet and byte counts</P
></LI
><LI
STYLE="list-style-type: disc"
><P
> Other IP-type packet and byte counts</P
></LI
><LI
STYLE="list-style-type: disc"
><P
> Non-IP packet and byte counts</P
></LI
><LI
STYLE="list-style-type: disc"
><P
> Checksum error count</P
></LI
><LI
STYLE="list-style-type: disc"
><P
> Interface activity</P
></LI
><LI
STYLE="list-style-type: disc"
><P
> Broadcast packet and byte counts</P
></LI
></UL
><P
> All IP byte counts (IP, TCP, UDP, ICMP, other IP) include IP header data
and payload. The data link header is not included. The full frame length
(including data-link header) is included in the non-IP and Total
byte count. All data-link headers are also included in the Total byte
counts.</P
><DIV
CLASS="FIGURE"
><A
NAME="AEN1145"
></A
><P
><IMG
SRC="iptraf-dstat1.png"></P
><P
><B
>Figure 2. The detailed interface statistics screen</B
></P
></DIV
><P
> The upper portion of the screen
contains the packet and byte counts for all IP and
non-IP packets intercepted on the interface. The lower portion
contains the total, incoming, and outgoing interface data rates.</P
><P
> This facility also displays incoming and outgoing counts and data rates.
The packet size breakdown in versions prior to 2.0.0 has been moved
to its own facility under <I
CLASS="EMPHASIS"
>Statistical breakdowns.../By packet
size</I
> as described in <A
HREF="statbreakdowns.html#PKTSIZE"
>Chapter 5</A
>.</P
><P
> An outgoing packet is one that exits your interface, regardless
of whether it originated from your machine or came
from another machine and was routed through yours. An incoming packet is
one that enters your interface, either addressed
to you directly, broadcast, multicast, or captured promiscuously.</P
><P
> The rate indicators can be set to display kbits/s or kbytes/s with the
<I
CLASS="EMPHASIS"
>Activity mode</I
> configuration option.</P
><DIV
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><P
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><B
>Note</B
></TH
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><TR
><TD
> </TD
><TD
ALIGN="LEFT"
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><P
> Buffering and some other factors may affect the data rates, notably
the outgoing rate, causing it to reflect a higher figure than the actual
rate at which the interface is sending.</P
></TD
></TR
></TABLE
></DIV
><P
> The figures are logged at regular intervals if logging is enabled. The
default log file name at the prompt is
<TT
CLASS="FILENAME"
>iface_stats_detailed-<TT
CLASS="REPLACEABLE"
><I
>iface</I
></TT
>.log</TT
>
where iface is the selected interface for this session (for example,
<TT
CLASS="FILENAME"
>iface_stats_detailed-eth0.log</TT
>).</P
><P
> If you wish to start this facility directly
from the command line, you can specify the
<TT
CLASS="COMPUTEROUTPUT"
>-d</TT
> parameter and an interface
to monitor. For example,</P
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><TD
><PRE
CLASS="SYNOPSIS"
>iptraf -d eth0</PRE
></TD
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><P
> starts the statistics for <TT
CLASS="FILENAME"
>eth0</TT
>. The interface must be specified, or
IPTraf will not start the facility.</P
><P
> 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
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><P
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><B
>Note</B
></TH
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><TR
><TD
> </TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> In both the general and detailed statistics screens, as well as
in the IP traffic monitor, the packet counts are for
actual network packets (layer 2), not the logical IP packets (layer 3)
that may be reconstructed after fragmentation. That means, if a
packet was fragmented into four pieces, and these four fragments pass
over your interface, the packet counts will indicate four separate
packets.
</P
></TD
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></DIV
><P
> The figure for the IP checksum errors is a packet count only, because the
corrupted IP header cannot be relied upon to give a correct IP
packet length value.</P
><P
> This facility's output is also affected by IPTraf's <A
HREF="filters.html"
>filters</A
>. See Chapter 7 for more information
on filters.</P
><P
> Pressing X or Q takes you back to the main menu (if this
facility was started with the command-line option, X or Q drops you back
to the shell).</P
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