source: connect/dhcp/dhcpcd.xml@ 0952b7d8

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
   "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
  <!ENTITY % general-entities SYSTEM "../../general.ent">
  %general-entities;

  <!ENTITY dhcpcd-download-http "http://prdownload.berlios.de/dhcpcd/dhcpcd-&dhcpcd-version;.tar.bz2">
  <!ENTITY dhcpcd-download-ftp  "ftp://ftp.osuosl.org/pub/gentoo/distfiles/dhcpcd-&dhcpcd-version;.tar.bz2">
  <!ENTITY dhcpcd-md5sum        "ec91c33b6d9cb46a42f9564e573fd249">
  <!ENTITY dhcpcd-size          "123 KB">
  <!ENTITY dhcpcd-buildsize     "1.2 MB">
  <!ENTITY dhcpcd-time          "less than 0.1 SBU">
]>

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

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

  <title>Dhcpcd-&dhcpcd-version;</title>

  <indexterm zone="dhcpcd">
    <primary sortas="a-Dhcpcd">Dhcpcd</primary>
  </indexterm>

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

    <para><application>dhcpcd</application>is an implementation of the
    DHCP client specified in RFC2131. This is useful for connecting
    your computer to a network which uses DHCP to assign network
    addresses.</para>

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

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

  </sect2>

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

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

<screen><userinput>./configure --prefix="" --mandir=/usr/share/man &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 install &amp;&amp;
chmod -v 754 /etc/dhcpc/dhcpcd.exe</userinput></screen>

  </sect2>

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

    <para><parameter>--prefix=""</parameter>: There may be a good reason for
    abandoning the normal BLFS convention of using
    <parameter>--prefix=/usr</parameter> here.  If you are installing
    DHCP, it is likely that it is
    required during the boot process and
    <filename class="directory">/usr</filename> may be network mounted, in which
    case <command>dhcpcd</command> wouldn't be available due to being on the
    network! Therefore, depending on your situation, you may want it to be
    installed in <filename class="directory">/sbin</filename> or
    <filename class="directory">/usr/sbin</filename>. This command installs to
    <filename class="directory">/sbin</filename>.</para>

  </sect2>

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

    <sect3 id="dhcpcd-config">
      <title>Config Files</title>

      <para><filename>/etc/dhcpc/dhcpcd.exe</filename></para>

      <indexterm zone="dhcpcd dhcpcd-config">
        <primary sortas="e-etc-dhcpc">/etc/dhcpc/dhcpcd.exe</primary>
      </indexterm>

    </sect3>

    <sect3 id="dhcpcd-init">
      <title>Configuration Information</title>

      <para>To configure <command>dhcpcd</command>, you need to first install
      the network service script,
      <filename>/etc/sysconfig/network-devices/services/dhcpcd</filename>
      included in the <xref linkend="bootscripts"/> package
      (as user <systemitem class="username">root</systemitem>):</para>

      <indexterm zone="dhcpcd dhcpcd-init">
        <primary sortas="f-dhcpcd">dhcpcd (service script)</primary>
      </indexterm>

<screen role='root'><userinput>make install-service-dhcpcd</userinput></screen>

      <para>Whenever <command>dhcpcd</command> configures or shuts down
      a network interface, it executes the script
      <filename>/etc/dhcpc/dhcpcd.exe</filename>. This script can be
      customized to perform additional actions for the network interface.
      See the man page of <command>dhcpcd</command> for more details.</para>

      <para id="dhcpcd-config2">Finally, as the <systemitem
      class="username">root</systemitem> user create the
      <filename>/etc/sysconfig/network-devices/ifconfig.eth0/dhcpcd</filename>
      configuration file using the following commands.  Adjust appropriately
      for additional interfaces:</para>

      <indexterm zone="dhcpcd dhcpcd-config2">
        <primary sortas="e-etc-sysconfig-dhcpcd">/etc/sysconfig/.../dhcpcd</primary>
      </indexterm>

<screen role='root'><userinput>install -v -d /etc/sysconfig/network-devices/ifconfig.eth0 &amp;&amp;
cat &gt; /etc/sysconfig/network-devices/ifconfig.eth0/dhcpcd &lt;&lt; "EOF"
<literal>ONBOOT="yes"
SERVICE="dhcpcd"
DHCP_START="<replaceable>&lt;insert appropriate start options here&gt;</replaceable>"
DHCP_STOP="-k <replaceable>&lt;insert additional stop options here&gt;</replaceable>"

# Set PRINTIP="yes" to have the script print
# the DHCP assigned IP address
PRINTIP="no"

# Set PRINTALL="yes" to print the DHCP assigned values for
# IP, SM, DG, and 1st NS. This requires PRINTIP="yes".
PRINTALL="no"</literal>
EOF</userinput></screen>

      <para>For more information on the appropriate <envar>DHCP_START</envar> and
      <envar>DHCP_STOP</envar> values, examine the man page for
      <command>dhcpcd</command>.</para>

      <note>
        <para id="dhcpcd-config3">The default behavior of
        <command>dhcpcd</command> is to overwrite (after making backup copies)
        <filename>/etc/resolv.conf</filename>, <filename>/etc/yp.conf</filename> and
        <filename>/etc/ntp.conf</filename> with new files containing information from
        the DHCP server. If this is undesirable, review the
        <command>dhcpcd</command> man page for switches to add to the
        <envar>DHCP_START</envar> value.</para>
      </note>

      <indexterm zone="dhcpcd dhcpcd-config3">
        <primary sortas="e-etc-resolv.conf">/etc/resolv.conf</primary>
      </indexterm>

      <indexterm zone="dhcpcd dhcpcd-config3">
        <primary sortas="e-etc-yp.conf">/etc/yp.conf</primary>
      </indexterm>

      <indexterm zone="dhcpcd dhcpcd-config3">
        <primary sortas="e-etc-ntp.conf">/etc/ntp.conf</primary>
      </indexterm>

    </sect3>

  </sect2>

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

    <segmentedlist>
      <segtitle>Installed Program</segtitle>
      <segtitle>Installed Libraries</segtitle>
      <segtitle>Installed Directory</segtitle>

      <seglistitem>
        <seg>dhcpcd</seg>
        <seg>None</seg>
        <seg>/etc/dhcpc and /var/lib/dhcpc</seg>
      </seglistitem>
    </segmentedlist>

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

      <varlistentry id="dhcpcd-prog">
        <term><command>dhcpcd</command></term>
        <listitem>
          <para>is an implementation of the DHCP client specified
          in RFC2131 (when -r option is not specified) and RFC1541
          (when -r option is specified).</para>
          <indexterm zone="dhcpcd dhcpcd-prog">
            <primary sortas="b-dhcpcd">dhcpcd</primary>
          </indexterm>
        </listitem>
      </varlistentry>

    </variablelist>

  </sect2>

</sect1>