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docs/Install-Guide/install-guide-2.2.2/node217.html
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docs/Install-Guide/install-guide-2.2.2/node217.html
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<!DOCTYPE HTML PUBLIC "-//W3O//DTD W3 HTML 2.0//EN">
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<!Converted with LaTeX2HTML 95.1 (Fri Jan 20 1995) by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds >
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<HEAD>
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<TITLE>5.3.3 SLIP Configuration</TITLE>
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</HEAD>
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<BODY>
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<meta name="description" value="5.3.3 SLIP Configuration">
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<meta name="keywords" value="gs">
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<meta name="resource-type" value="document">
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<meta name="distribution" value="global">
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<P>
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<BR> <HR><A NAME=tex2html4555 HREF="node218.html"><IMG ALIGN=BOTTOM ALT="next" SRC="next_motif.gif"></A> <A NAME=tex2html4553 HREF="node206.html"><IMG ALIGN=BOTTOM ALT="up" SRC="up_motif.gif"></A> <A NAME=tex2html4547 HREF="node216.html"><IMG ALIGN=BOTTOM ALT="previous" SRC="previous_motif.gif"></A> <A NAME=tex2html4557 HREF="node1.html"><IMG ALIGN=BOTTOM ALT="contents" SRC="contents_motif.gif"></A> <A NAME=tex2html4558 HREF="node250.html"><IMG ALIGN=BOTTOM ALT="index" SRC="index_motif.gif"></A> <BR>
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<B> Next:</B> <A NAME=tex2html4556 HREF="node218.html">5.3.3.1 Static IP address </A>
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<B>Up:</B> <A NAME=tex2html4554 HREF="node206.html">5.3 Networking with TCP/IP</A>
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<B> Previous:</B> <A NAME=tex2html4548 HREF="node216.html">5.3.2.8 Trying it out</A>
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<BR> <HR> <P>
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<H2><A NAME=SECTION00733000000000000000>5.3.3 SLIP Configuration</A></H2>
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<P>
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<A NAME=5916> </A>
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<A NAME=5917> </A>
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<A NAME=5918> </A>
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<A NAME=5919> </A>
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SLIP (Serial Line Internet Protocol) allows you to use TCP/IP
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over a serial line, be that a phone line, with a dialup modem, or
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a leased asynchronous line of some sort. Of course, to use SLIP you'll
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need access to a dial-in SLIP server in your area. Many universities
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and businesses provide SLIP access for a modest fee.
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<P>
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<A NAME=6101> </A>
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<A NAME=6102> </A>
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There are two major SLIP-related programs available---<tt>dip</tt> and
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<tt>slattach</tt>. Both of these programs are used to initiate a SLIP
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connection over a serial device. It is <em>necessary</em> to use one
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of these programs in order to enable SLIP---it will not suffice to
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dial up the SLIP server (with a communications program such as
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<tt>kermit</tt>) and issue <tt>ifconfig</tt> and <tt>route</tt> commands.
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This is because <tt>dip</tt> and <tt>slattach</tt> issue a special
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<em>ioctl()</em> system call to seize control of the serial device to
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be used as a SLIP interface.
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<P>
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<tt>dip</tt> can be used to dial up a SLIP server,
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do some handshaking to login to the server (exchanging your username
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and password, for example) and then initate the SLIP connection over the
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open serial line. <tt>slattach</tt>, on the other hand, does very little
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other than grab the serial device for use by SLIP. It is useful if you
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have a permanent line to your SLIP server and no modem dialup or handshaking
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is necessary to initiate the connection. Most dialup SLIP users should
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use <tt>dip</tt>, on the other hand.
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<P>
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<tt>dip</tt> can also be used to configure your Linux system as a SLIP
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server, where other machines can dial into your own and connect to the
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network through a secondary Ethernet connection on your machine.
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See the documentation and man pages for <tt>dip</tt> for more information
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on this procedure.
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<P>
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<A NAME=5936> </A>
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<A NAME=5937> </A>
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<A NAME=5938> </A>
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<A NAME=5939> </A>
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SLIP is quite unlike Ethernet, in that there are only two machines
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on the ``network''---the SLIP host (that's you) and the SLIP server.
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For this reason, SLIP is often referred to as a ``point-to-point''
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connection. A generalization of this idea, known as PPP (Point to Point
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Protocol) has also been implemented for Linux.
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<P>
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When you initiate a connection to a SLIP server, the SLIP server will
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give you an IP address based on (usually) one of two methods. Some
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SLIP servers allocate ``static'' IP addresses---in which case your
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IP address will be the same every time you connect to the server.
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However, many SLIP servers allocate IP addresses dynamically---in which
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case you receive a different IP address each time you connect.
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In general, the SLIP server will print the values of your IP and
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gateway addresses when you connect. <tt>dip</tt> is capable of reading
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these values from the output of the SLIP server login session and
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using them to configure the SLIP device.
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<P>
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Essentially, configuring a SLIP connection is just like configuring
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for loopback or ethernet. The main differences are discussed below.
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Read the previous section on configuring the basic TCP/IP files,
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and apply the changes described below.
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<P>
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<BR> <HR>
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<UL>
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<LI> <A NAME=tex2html4559 HREF="node218.html#SECTION00733100000000000000">5.3.3.1 Static IP address SLIP connections using dip</A>
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<LI> <A NAME=tex2html4560 HREF="node219.html#SECTION00733200000000000000">5.3.3.2 Static IP address SLIP connections using slattach</A>
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<LI> <A NAME=tex2html4561 HREF="node220.html#SECTION00733300000000000000">5.3.3.3 Dynamic IP address SLIP connections using dip</A>
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</UL>
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<BR> <HR><A NAME=tex2html4555 HREF="node218.html"><IMG ALIGN=BOTTOM ALT="next" SRC="next_motif.gif"></A> <A NAME=tex2html4553 HREF="node206.html"><IMG ALIGN=BOTTOM ALT="up" SRC="up_motif.gif"></A> <A NAME=tex2html4547 HREF="node216.html"><IMG ALIGN=BOTTOM ALT="previous" SRC="previous_motif.gif"></A> <A NAME=tex2html4557 HREF="node1.html"><IMG ALIGN=BOTTOM ALT="contents" SRC="contents_motif.gif"></A> <A NAME=tex2html4558 HREF="node250.html"><IMG ALIGN=BOTTOM ALT="index" SRC="index_motif.gif"></A> <BR>
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<B> Next:</B> <A NAME=tex2html4556 HREF="node218.html">5.3.3.1 Static IP address </A>
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<B>Up:</B> <A NAME=tex2html4554 HREF="node206.html">5.3 Networking with TCP/IP</A>
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<B> Previous:</B> <A NAME=tex2html4548 HREF="node216.html">5.3.2.8 Trying it out</A>
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<BR> <HR> <P>
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<BR> <HR>
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<P><ADDRESS>
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<I>Matt Welsh <BR>
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mdw@sunsite.unc.edu</I>
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</ADDRESS>
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</BODY>
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