source: networking/connect/dhcp.xml@ 6d15c62

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
   "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
  <!ENTITY % general-entities SYSTEM "../../general.ent">
  %general-entities;
  <!ENTITY dhcp-download-http "http://gd.tuwien.ac.at/infosys/servers/isc/dhcp/dhcp-&dhcp-version;.tar.gz">
  <!ENTITY dhcp-download-ftp "ftp://ftp.isc.org/isc/dhcp/dhcp-&dhcp-version;.tar.gz">
  <!ENTITY dhcp-md5sum "724bad21ad8b638abadd5fcc07df1a0f">
  <!ENTITY dhcp-size "876 KB">
  <!ENTITY dhcp-buildsize "21 MB">
  <!ENTITY dhcp-time "0.1 SBU">
]>

<sect1 id="dhcp" xreflabel="DHCP-&dhcp-version;">
  <?dbhtml filename="dhcp.html"?>

  <sect1info>
    <othername>$LastChangedBy$</othername>
    <date>$Date$</date>
  </sect1info>

  <title>DHCP-&dhcp-version;</title>

  <indexterm zone="dhcp">
    <primary sortas="a-dhcp">Dhcp</primary>
  </indexterm>

  <sect2 role="package">
    <title>Introduction to DHCP</title>

    <para>The <application>DHCP</application> package contains both the client
    and server programs for DHCP. <command>dhclient</command> (the client) is
    useful for connecting your computer to a network which uses DHCP to assign
    network addresses. <command>dhcpd</command> (the server) is useful for
    assigning network addresses on your private network.</para>

    <bridgehead renderas="sect3">Package Information</bridgehead>
    <itemizedlist spacing="compact">
      <listitem>
        <para>Download (HTTP): <ulink url="&dhcp-download-http;"/></para>
      </listitem>
      <listitem>
        <para>Download (FTP): <ulink url="&dhcp-download-ftp;"/></para>
      </listitem>
      <listitem>
        <para>Download MD5 sum: &dhcp-md5sum;</para>
      </listitem>
      <listitem>
        <para>Download size: &dhcp-size;</para>
      </listitem>
      <listitem>
        <para>Estimated disk space required: &dhcp-buildsize;</para>
      </listitem>
      <listitem>
        <para>Estimated build time: &dhcp-time;</para>
      </listitem>
    </itemizedlist>

    <bridgehead renderas="sect3">Additional Downloads</bridgehead>
    <itemizedlist spacing='compact'>
      <listitem>
        <para>Required Patch:
        <ulink url="&patch-root;/dhcp-&dhcp-version;-client_dns-1.patch"/></para>
      </listitem>
      <listitem>
        <para>Optional Patch:
        <ulink url="&patch-root;/dhcp-&dhcp-version;-iproute2-1.patch"/></para>
      </listitem>
    </itemizedlist>

    <bridgehead renderas="sect3">DHCP Dependencies</bridgehead>

    <bridgehead renderas="sect4">Required</bridgehead>
    <para role="required"><xref linkend="net-tools"/> (you may omit
    <application>net-tools</application> by using the optional patch
    to utilize <application>iproute2</application>.</para>

    <para condition="html" role="usernotes">User Notes:
    <ulink url="&blfs-wiki;/dhcp"/></para>

  </sect2>

  <sect2 role="kernel" id='dhcp-kernel'>
    <title>Kernel Configuration</title>

    <para>You must have Packet Socket support (Device Drivers &rArr; Networking
    Support &rArr; Networking Options &rArr; Packet Socket) compiled into
    the kernel.</para>

    <indexterm zone="dhcp dhcp-kernel">
      <primary sortas="d-dhcp">DHCP</primary>
    </indexterm>

  </sect2>

  <sect2 role="installation">
    <title>Installation of DHCP</title>

    <para>First fix a problem with always regenerating
          /etc/resolv.conf whether the DNS server has changed or not.</para>

<screen><userinput>patch -Np1 -i ../dhcp-&dhcp-version;-client_dns-1.patch</userinput></screen>

    <para>If you chose not to install net-tools, apply the
    iproute2 patch:</para>

<screen><userinput>patch -Np1 -i ../dhcp-&dhcp-version;-iproute2-1.patch</userinput></screen>

    <para>Install <application>DHCP</application> by running
    the following commands:</para>

<screen><userinput>./configure &amp;&amp;
make</userinput></screen>

    <para>This package does not come with a test suite.</para>

    <para>Now, as the <systemitem class="username">root</systemitem> user:</para>

<screen role="root"><userinput>make LIBDIR=/usr/lib INCDIR=/usr/include install</userinput></screen>

  </sect2>

  <sect2 role="commands">
    <title>Command Explanations</title>

    <para><parameter>LIBDIR=/usr/lib INCDIR=/usr/include</parameter>: This
    command installs the library and include files in
    <filename class="directory">/usr</filename> instead of
    <filename class="directory">/usr/local</filename>.</para>

  </sect2>

  <sect2 role="configuration">
    <title>Configuring DHCP</title>

    <sect3 id='dhcp-config'>
      <title>Config Files</title>

      <para><filename>/etc/dhclient.conf</filename> and
      <filename>/etc/dhcpd.conf</filename></para>

      <indexterm zone="dhcp dhcp-config">
        <primary sortas="e-etc-dhclient.conf">/etc/dhclient.conf</primary>
      </indexterm>

      <indexterm zone="dhcp dhcp-config">
        <primary sortas="e-etc-dhcpd.conf">/etc/dhcpd.conf</primary>
      </indexterm>

    </sect3>

    <sect3 id='dhcp-init'>
      <title>Configuration Information</title>

      <para>Information on configuring the DHCP client can be
      found in <xref linkend="basicnet-connect"/>.</para>

      <para>Note that you only need the DHCP server if you want to issue
      LAN addresses over your network. The DHCP client doesn't need this
      script to be used.  Also note that this script is coded for the
      <emphasis role="strong">eth1</emphasis> interface, which may need
      to be modified for your hardware configuration.</para>

      <para>Install the <filename>/etc/rc.d/init.d/dhcp</filename>
      init script included in the <xref linkend="bootscripts"/>
      package.</para>

      <indexterm zone="dhcp dhcp-init">
        <primary sortas="f-dhcp">dhcpd</primary>
      </indexterm>

<screen role="root"><userinput>make install-dhcp</userinput></screen>

      <para>The lease file must exist on startup. The following command will
      satisfy that requirement:</para>

<screen role="root"><userinput>touch /var/state/dhcp/dhcpd.leases</userinput></screen>

      <para>The following commands will create a base configuration file
      for a DHCP server.  There are several options that you may want to
      add (information that is passed back to the DHCP client) and those
      are covered in the man pages for <filename>dhcp.conf</filename>.</para>

<screen role="root"><userinput>cat &gt; /etc/dhcpd.conf &lt;&lt; "EOF"
<literal>default-lease-time 72000;
max-lease-time 144000;
ddns-update-style ad-hoc;

subnet <replaceable>&lt;192.168.5.0&gt;</replaceable> netmask <replaceable>&lt;255.255.255.0&gt;</replaceable> {
  range <replaceable>&lt;192.168.5.10&gt; &lt;192.168.5.240&gt;</replaceable>;
  option broadcast-address <replaceable>&lt;192.168.5.255&gt;</replaceable>;
  option routers <replaceable>&lt;192.168.5.1&gt;</replaceable>;
}</literal>
EOF</userinput></screen>

      <para>All addresses should be changed to meet your circumstance.</para>

    </sect3>

  </sect2>

  <sect2 role="content">
    <title>Contents</title>

    <segmentedlist>
      <segtitle>Installed Programs</segtitle>
      <segtitle>Installed Libraries</segtitle>
      <segtitle>Installed Directories</segtitle>

      <seglistitem>
        <seg>dhcpd, dhcrelay, dhclient, dhclient-script, and omshell</seg>
        <seg>bdhcpctl.a, libomapi.a</seg>
        <seg>/var/state/dhcp, /usr/include/omapip, and /usr/include/isi-dhcp</seg>
      </seglistitem>
    </segmentedlist>

    <variablelist>
      <bridgehead renderas="sect3">Short Descriptions</bridgehead>
      <?dbfo list-presentation="list"?>
      <?dbhtml list-presentation="table"?>

      <varlistentry id="dhclient">
        <term><command>dhclient</command></term>
        <listitem>
          <para>is the implementation of the DHCP client.</para>
          <indexterm zone="dhcp dhclient">
            <primary sortas="b-dhclient">dhclient</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="dhcpd">
        <term><command>dhcpd</command></term>
        <listitem>
          <para>implements Dynamic Host Configuration Protocol (DHCP) and
          Internet Bootstrap Protocol (BOOTP) requests for network
          addresses.</para>
          <indexterm zone="dhcp dhcpd">
            <primary sortas="b-dhcpd">dhcpd</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="dhcrelay">
        <term><command>dhcrelay</command></term>
        <listitem>
          <para>provides a means to accept DHCP and BOOTP requests on a subnet
          without a DHCP server and relay them to a DHCP server on another
          subnet.</para>
          <indexterm zone="dhcp dhcrelay">
            <primary sortas="b-dhcrelay">dhcrelay</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="omshell">
        <term><command>omshell</command></term>
        <listitem>
          <para> provides an interactive way to connect to, query, and
          possibly change, the ISC DHCP Server's state via OMAPI, the
          Object Management API.</para>
          <indexterm zone="dhcp omshell">
            <primary sortas="b-omshell">omshell</primary>
          </indexterm>
        </listitem>
      </varlistentry>

    </variablelist>

  </sect2>

</sect1>