source: server/other/dhcp.xml@ 785b956

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
   "http://www.oasis-open.org/docbook/xml/4.3/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-size "852 KB">
<!ENTITY dhcp-buildsize "29.6 MB">
<!ENTITY dhcp-time "0.23 SBU">

]>

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

<sect2>
<title>Introduction to <application><acronym>DHCP</acronym></application></title>

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

<sect3><title>Package information</title>
<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 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>
</sect3>

</sect2>

<sect2>
<title>Installation of <application><acronym>DHCP</acronym></application></title>

<note><para>You must have Packet Socket support compiled in the kernel and 
Socket Filtering either compiled in or as a kernel module.</para></note>
                                                                                
<para>Install <application><acronym>DHCP</acronym></application> by running the following commands:</para>

<screen><userinput><command>./configure &amp;&amp;
make &amp;&amp;
make LIBDIR=/usr/lib INCDIR=/usr/include install</command></userinput></screen>

</sect2>

<sect2>
<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>
<title>Configuring <application><acronym>DHCP</acronym></application></title>

<sect3><title>Config files</title>
<para><filename>/etc/dhclient.conf</filename></para>
</sect3>

<sect3><title>Configuration Information</title>

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

<para>Note that you only need the <acronym>DHCP</acronym> server if 
you want to issue <acronym>LAN</acronym> addresses over your network.  The 
<acronym>DHCP</acronym> 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="intro-important-bootscripts"/> package.</para>
                                                                                                                
<screen><userinput><command>make install-dhcp</command></userinput></screen>

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

<screen><userinput><command>touch /var/state/dhcp/dhcpd.leases</command></userinput></screen>

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

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

subnet <replaceable>[192.168.5.0]</replaceable> netmask <replaceable>[255.255.255.0]</replaceable> {
  range <replaceable>[192.168.5.10] [192.168.5.240]</replaceable>;
  option broadcast-address <replaceable>[195.168.5.255]</replaceable>;
  option routers <replaceable>[192.168.5.1]</replaceable>;
}
<command>EOF</command></userinput></screen>

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

</sect3>

</sect2>

<sect2>
<title>Contents</title>

<para>The <application><acronym>DHCP</acronym></application> package contains 
<command>dhclient</command>, <command>dhcpd</command> and <command>dhcrelay</command>.</para>

</sect2>

<sect2><title>Description</title>

<sect3><title>dhclient</title>
<para><command>dhclient</command> is the implementation of the
<acronym>DHCP</acronym> client.</para></sect3>

<sect3><title>dhcpd</title>
<para><command>dhcpd</command> implements Dynamic Host Configuration Protocol 
(<acronym>DHCP</acronym>) and Internet Bootstrap Protocol
(<acronym>BOOTP</acronym>) requests for network addresses.</para></sect3>

<sect3><title>dhcrelay</title>
<para><command>dhcrelay</command> provides a means to accept <acronym>DHCP
</acronym> and <acronym>BOOTP</acronym> requests on a subnet without a 
<acronym>DHCP</acronym> server and relay them to a <acronym>DHCP</acronym> 
server on another subnet.</para></sect3>

</sect2>

</sect1>