Blame Manuals/HowTos/Dialup/Server/Usage/overview.docbook

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<sect1 id="server-usage-overview">
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    <title>Overview</title>
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    <para>
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        The infrastructure described in this chapter uses the
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        client/server model to provide a public mail service through
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        the telephone line. In this configuration, we (the poeple
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        building the infrastructure) provide the information you (the
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        person using the infrastructure) need to know in order to
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        establish a dial-up connection from the client computer to the
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        server computer through the telephone line.
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    </para>
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    <para>
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        The infrastructure described in this chapter is made available
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        to you free of charge, however, you should know that
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        maintaining it costs both money and time. For example, for
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        each hour the server computer is on production there is an
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        electrical consume that need to be paid every month.
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        Likewise, each call that you establish from the client
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        computer to the server computer will cost you money, based on
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        the location you made the call from and the time you spend
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        connected.
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    </para>
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    <para>
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        In this manual, by dial-up connection we mean the action of
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        dialing-up a server computer from a client computer through a
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        Modem attached to the telephone line. In this infrastructure,
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        dial-up connections are always established from the client
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        computer to the server computer and never the other way
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        around.  The main purpose of a client computer to establish a
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        dial-up connection with the server computer will be using one
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        or more Internet services provided in the server computer.
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    </para>
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    <para>
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        In order for the server computer to answer telephone calls, it
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        is required to install a Modem device in it (see 
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        linkend="server-install-modem" />). Once the Modem device has
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        been installed, you need to install and configure both
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        <application>mgetty</application> and
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        <application>pppd</application> programs.  The
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        <application>mgetty</application> program must be run by
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        <systemitem class="daemon">init</systemitem> daemon in order
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        to take control over the Modem device. By default, inside
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        &TC;; (release 5.5), mgetty isn't configured to start with
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        <systemitem class="daemon">init</systemitem> daemon so you
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        need to do it yourself (see ...). Later, for attending
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        connection requests, you need to configure mgetty to use the
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        <application>pppd</application> program, so the Point-to-Point
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        Protocol (PPP) can be talked and IP packages can be
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        interchanged between the client computer and the server
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        computer. Later, you need to configure
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        <application>pppd</application> to adjust it to your needs
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        (see ...). 
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    </para>
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    <para>
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        Once you've configured both <application>mgetty</application>
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        and <application>pppd</application> programs, the server
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        computer should be ready to attend incoming calls.  The
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        remaining of this chapter describes the way incoming calls are
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        attended by the server computer once they have arrived to its
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        Modem device.
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    </para>
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</sect1>