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<TITLE>Special Edition Using Linux, Fourth Edition:Configuring a TCP/IP Network</TITLE>

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<P><BR></P>

<P>The following is an example of using the <TT>-i</TT> option, and Table 24.9 explains each field in the listing.</P>

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<PRE>

$ <B>netstat -i</B>

Kernel Interface table

Iface  MTU Met  RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR

Flags	

lo     2000  0      0       0      0      0  1558      1      0     0

LRU

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<TABLE WIDTH="100%">

<CAPTION ALIGN=LEFT><B>Table 24.9</B> Fields in the Kernel Interface Table

<TR>

<TH COLSPAN="3"><HR>

<TR>

<TH WIDTH="15%" ALIGN="LEFT">Field

<TH WIDTH="85%" ALIGN="LEFT" COLSPAN="2">Description

<TR>

<TD COLSPAN="3"><HR>

<TR>

<TD><TT>Iface</TT>

<TD COLSPAN="2">The name of the network interface.

<TR>

<TD VALIGN="TOP"><TT>MTU</TT>

<TD COLSPAN="2">The largest number of bytes that can be sent in one transmission by this interface.

<TR>

<TD><TT>Met</TT>

<TD COLSPAN="2">The metric value for this interface.

<TR>

<TD><TT>RX-OK</TT>

<TD COLSPAN="2">The number of packets received with no errors.

<TR>

<TD><TT>RX-ERR</TT>

<TD COLSPAN="2">The number of packets received with errors.

<TR>

<TD><TT>RX-DRP</TT>

<TD COLSPAN="2">The number of packets dropped.

<TR>

<TD><TT>RX-OVR</TT>

<TD COLSPAN="2">The number of packet overrun errors.

<TR>

<TD><TT>TX-OK</TT>

<TD COLSPAN="2">The number of packets transmitted with no errors.

<TR>

<TD><TT>TX-ERR</TT>

<TD COLSPAN="2">The number of packets transmitted with errors.

<TR>

<TD><TT>TX-DRP</TT>

<TD COLSPAN="2">The number of packets dropped during transmission.

<TR>

<TD><TT>TX-OVR</TT>

<TD COLSPAN="2">The number of packets dropped due to overrun errors.

<TR>

<TD><TT>Flags</TT>

<TD COLSPAN="2">The following flags can be shown in this field:

<TR>

<TD>

<TD WIDTH="5%"><TT>A</TT>

<TD WIDTH="75%">The interface receives packets for multicast addresses.

<TR>

<TD>

<TD><TT>B</TT>

<TD>The interface receives broadcast packets.

<TR>

<TD>

<TD><TT>D</TT>

<TD>The interface debugging feature is now activated.

<TR>

<TD>

<TD><TT>L</TT>

<TD>This is the loopback interface.

<TR>

<TD>

<TD><TT>M</TT>

<TD>The interface is in promiscuous mode.

<TR>

<TD>

<TD><TT>N</TT>

<TD>The interface doesn&#146;t process trailers on packets.

<TR>

<TD>

<TD><TT>O</TT>

<TD>The Address Resolution Protocol is turned off on this interface.

<TR>

<TD>

<TD><TT>P</TT>

<TD>This interface is being used as a point-to-point connection.

<TR>

<TD>

<TD><TT>R</TT>

<TD>The interface is running.

<TR>

<TD>

<TD><TT>U</TT>

<TD>The interface has been activated.

<TR>

<TD COLSPAN="3"><HR>

</TABLE>

<H3><A NAME="Heading17"></A><FONT COLOR="#000077">From Here&#133;</FONT></H3>

<P>This chapter covers the basics of configuring a Linux machine for use on a network. More information can be found in the man pages for the discussed commands. For more information on TCP/IP networking and configuration, see the following chapters:

</P>

<DL>

<DD><B>&#149;</B>&nbsp;&nbsp;Chapter 18, &#147;Understanding Linux Shells,&#148; gives more details on writing shell scripts.

<DD><B>&#149;</B>&nbsp;&nbsp;Chapter 23, &#147;Understanding the TCP/IP Protocol Suite,&#148; explains the details of the TCP/IP protocols.

<DD><B>&#149;</B>&nbsp;&nbsp;Chapter 25, &#147;Configuring Domain Name Service,&#148; shows you how to set up Linux as a DNS client and server.

</DL>

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