glfs/connect/dhcp/dhcp-client.xml

<?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;
]>

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

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

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

  <indexterm zone="dhcp-client">
    <primary sortas="b-dhclient">dhclient</primary>
  </indexterm>

  <para>The <application>DHCP</application> package comes with
  both a client (<command>dhclient</command>) and a server program for 
  using DHCP.  If you want to install this package, 
  the instructions can be found at <xref linkend="dhcp"/>.
  Note that if you only want to use the client, you 
  do <emphasis>not</emphasis> need to run the server and so do not need 
  the startup script and links provided for the server daemon.
  You only need to run the DHCP server if you're providing 
  this service to a network, and it's likely that you'll know if that's the
  case; if it isn't, don't run the server!  Once you have installed the
  package, return here for information on how to configure the client
  (<command>dhclient</command>).</para>

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

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

      <indexterm zone="dhcp-client dhclient-service">
        <primary sortas="f-dhclient">dhclient (service script)</primary>
      </indexterm>

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

    <para id="dhclient-config1">Next, create the 
    <filename>/etc/sysconfig/network-devices/ifconfig.eth0/dhclient</filename>
    configuration file with the following commands as the <systemitem 
    class="username">root</systemitem> user.  Adjust as 
    necessary for additional interfaces:</para>

    <indexterm zone="dhcp-client dhclient-config1">
      <primary sortas="e-etc-sysconfig-...-dhclient">/etc/sysconfig/.../dhclient</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/dhclient &lt;&lt; "EOF"
<literal>ONBOOT="yes"
SERVICE="dhclient"
DHCP_START="-q <replaceable>[add additional start parameters here]</replaceable>"
DHCP_STOP="-q -r <replaceable>[add additional stop parameters here]</replaceable>"</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>dhclient</command>.</para>

    <para id="dhclient-config2">Finally, you should create the 
    <filename>/etc/dhclient.conf</filename> file using the following commands 
    as the <systemitem class="username">root</systemitem> user:</para>

    <indexterm zone="dhcp-client dhclient-config2">
      <primary sortas="e-etc-dhclient.conf">/etc/dhclient.conf</primary>
    </indexterm>

    <note>
      <para>You'll need to add a second interface definition to the file if you 
      have more than one interface.</para>
    </note>

<screen role='root'><userinput>cat &gt; /etc/dhclient.conf &lt;&lt; "EOF"
<literal># dhclient.conf

interface "eth0"{
prepend domain-name-servers 127.0.0.1;
request subnet-mask, broadcast-address, time-offset, routers,
        domain-name, domain-name-servers, host-name;
require subnet-mask, domain-name-servers;
}
# end dhclient.conf</literal>
EOF</userinput></screen>

  </sect2>

</sect1>