| 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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| 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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| 3 | "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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| 4 | <!ENTITY % general-entities SYSTEM "../../general.ent">
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| 5 | %general-entities;
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| 6 |
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| 7 | <!ENTITY dhcp-download-http " ">
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| 8 | <!ENTITY dhcp-download-ftp "ftp://ftp.isc.org/isc/dhcp/&dhcp-version;/dhcp-&dhcp-version;.tar.gz">
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| 9 | <!ENTITY dhcp-md5sum "0138319fe2b788cf4bdf34fbeaf9ff54">
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| 10 | <!ENTITY dhcp-size "8.9 MB">
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| 11 | <!ENTITY dhcp-buildsize "213 MB">
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| 12 | <!ENTITY dhcp-time "0.5 SBU">
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| 13 | ]>
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| 14 |
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| 15 | <sect1 id="dhcp" xreflabel="DHCP-&dhcp-version;">
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| 16 | <?dbhtml filename="dhcp.html"?>
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| 17 |
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| 18 | <sect1info>
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| 19 | <othername>$LastChangedBy$</othername>
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| 20 | <date>$Date$</date>
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| 21 | </sect1info>
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| 22 |
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| 23 | <title>DHCP-&dhcp-version;</title>
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| 24 |
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| 25 | <indexterm zone="dhcp">
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| 26 | <primary sortas="a-DHCP">DHCP</primary>
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| 27 | </indexterm>
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| 28 |
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| 29 | <sect2 role="package">
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| 30 | <title>Introduction to ISC DHCP</title>
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| 31 |
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| 32 | <para>
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| 33 | The <application>ISC DHCP</application> package contains both the client and
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| 34 | server programs for DHCP. <command>dhclient</command> (the client) is
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| 35 | used for connecting to a network which uses DHCP to assign network
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| 36 | addresses. <command>dhcpd</command> (the server) is used for assigning
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| 37 | network addresses on private networks.
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| 38 | </para>
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| 39 |
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| 40 | &lfs77_checked;
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| 41 |
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| 42 | <note>
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| 43 | <para>
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| 44 | Make sure that you disable the <command>systemd-networkd</command> service
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| 45 | or configure it not to manage the interfaces you want to manage with
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| 46 | <application>DHCP</application> client.
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| 47 | </para>
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| 48 | </note>
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| 49 |
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| 50 | <bridgehead renderas="sect3">Package Information</bridgehead>
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| 51 | <itemizedlist spacing="compact">
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| 52 | <listitem>
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| 53 | <para>
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| 54 | Download (HTTP): <ulink url="&dhcp-download-http;"/>
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| 55 | </para>
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| 56 | </listitem>
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| 57 | <listitem>
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| 58 | <para>
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| 59 | Download (FTP): <ulink url="&dhcp-download-ftp;"/>
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| 60 | </para>
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| 61 | </listitem>
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| 62 | <listitem>
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| 63 | <para>
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| 64 | Download MD5 sum: &dhcp-md5sum;
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| 65 | </para>
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| 66 | </listitem>
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| 67 | <listitem>
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| 68 | <para>
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| 69 | Download size: &dhcp-size;
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| 70 | </para>
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| 71 | </listitem>
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| 72 | <listitem>
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| 73 | <para>
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| 74 | Estimated disk space required: &dhcp-buildsize;
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| 75 | </para>
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| 76 | </listitem>
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| 77 | <listitem>
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| 78 | <para>
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| 79 | Estimated build time: &dhcp-time;
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| 80 | </para>
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| 81 | </listitem>
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| 82 | </itemizedlist>
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| 83 |
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| 84 | <bridgehead renderas="sect3">Additional Downloads</bridgehead>
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| 85 | <itemizedlist spacing="compact">
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| 86 | <listitem>
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| 87 | <para>
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| 88 | Required patch:
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| 89 | <ulink url="&patch-root;/dhcp-&dhcp-version;-client_script-1.patch"/>
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| 90 | </para>
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| 91 | </listitem>
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| 92 | <listitem>
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| 93 | <para>
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| 94 | Optional patch:
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| 95 | <ulink url="&patch-root;/dhcp-&dhcp-version;-missing_ipv6-1.patch"/>
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| 96 | </para>
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| 97 | </listitem>
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| 98 | </itemizedlist>
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| 99 |
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| 100 | <para condition="html" role="usernotes">User Notes:
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| 101 | <ulink url="&blfs-wiki;/dhcp"/>
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| 102 | </para>
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| 103 | </sect2>
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| 104 |
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| 105 | <sect2 role="kernel" id="dhcp-kernel">
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| 106 | <title>Kernel Configuration</title>
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| 107 |
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| 108 | <para>
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| 109 | You must have Packet Socket support:
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| 110 | </para>
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| 111 |
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| 112 | <screen><literal>[*] Networking support ---> [CONFIG_NET]
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| 113 | Networking options --->
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| 114 | <*> Packet socket [CONFIG_PACKET]</literal></screen>
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| 115 |
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| 116 | <para>
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| 117 | If you do not have IPv6 support:
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| 118 | </para>
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| 119 |
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| 120 | <screen><literal>[*] Networking support ---> [CONFIG_NET]
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| 121 | Networking Options --->
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| 122 | <*> The IPv6 Protocol ---> [CONFIG_IPV6]</literal></screen>
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| 123 |
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| 124 | <para>
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| 125 | compiled in, then you must use the <quote>missing_ipv6</quote> patch.
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| 126 | </para>
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| 127 |
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| 128 | <indexterm zone="dhcp dhcp-kernel">
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| 129 | <primary sortas="d-DHCP">DHCP</primary>
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| 130 | </indexterm>
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| 131 |
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| 132 | </sect2>
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| 133 |
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| 134 | <sect2 role="installation">
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| 135 | <title>Installation of ISC DHCP</title>
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| 136 |
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| 137 | <note>
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| 138 | <para>
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| 139 | This package does not support parallel build.
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| 140 | </para>
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| 141 | </note>
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| 142 |
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| 143 | <para>
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| 144 | If you have not compiled IPv6 support into the kernel, apply the
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| 145 | missing_ipv6 patch:
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| 146 | </para>
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| 147 |
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| 148 | <screen><userinput>patch -Np1 -i ../dhcp-&dhcp-version;-missing_ipv6-1.patch</userinput></screen>
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| 149 |
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| 150 | <note>
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| 151 | <para>
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| 152 | Be careful with the instructions below. The single and
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| 153 | double quotes are important because the defined
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| 154 | variables are used verbatim in the code.
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| 155 | </para>
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| 156 | </note>
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| 157 |
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| 158 | <para>
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| 159 | Install <application>ISC DHCP</application> by running
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| 160 | the following commands:
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| 161 | </para>
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| 162 |
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| 163 | <screen><userinput>patch -Np1 -i ../dhcp-&dhcp-version;-client_script-1.patch &&
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| 164 | CFLAGS="-D_PATH_DHCLIENT_SCRIPT='\"/sbin/dhclient-script\"' \
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| 165 | -D_PATH_DHCPD_CONF='\"/etc/dhcp/dhcpd.conf\"' \
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| 166 | -D_PATH_DHCLIENT_CONF='\"/etc/dhcp/dhclient.conf\"'" \
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| 167 | ./configure --prefix=/usr \
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| 168 | --sysconfdir=/etc/dhcp \
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| 169 | --localstatedir=/var \
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| 170 | --with-srv-lease-file=/var/lib/dhcpd/dhcpd.leases \
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| 171 | --with-srv6-lease-file=/var/lib/dhcpd/dhcpd6.leases \
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| 172 | --with-cli-lease-file=/var/lib/dhclient/dhclient.leases \
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| 173 | --with-cli6-lease-file=/var/lib/dhclient/dhclient6.leases &&
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| 174 | make -j1</userinput></screen>
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| 175 |
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| 176 | <para>
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| 177 | <!-- To test the results, issue: <command>make check</command>
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| 178 |
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| 179 | Note: make check builds a library, but otherwise does nothing.
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| 180 |
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| 181 | -->
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| 182 | This packages does not come with a test suite.
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| 183 | </para>
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| 184 |
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| 185 | <para>
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| 186 | If you only want to install the <application>ISC DHCP</application> client,
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| 187 | issue the following commands as the
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| 188 | <systemitem class="username">root</systemitem> user:
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| 189 | </para>
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| 190 |
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| 191 | <screen role="root"><userinput>make -C client install &&
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| 192 | mv -v /usr/sbin/dhclient /sbin &&
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| 193 | install -v -m755 client/scripts/linux /sbin/dhclient-script</userinput></screen>
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| 194 |
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| 195 | <para>
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| 196 | Skip to <xref linkend="dhclient-config"/> in order to configure the client
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| 197 | </para>
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| 198 |
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| 199 | <para>
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| 200 | If you only want to install the <application>ISC DHCP</application> server,
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| 201 | issue the following command as the
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| 202 | <systemitem class="username">root</systemitem> user:
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| 203 | </para>
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| 204 |
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| 205 | <screen role="root"><userinput>make -C server install</userinput></screen>
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| 206 |
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| 207 | <para>
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| 208 | Skip to <xref linkend="dhcpd-config"/> in order to configure the server.
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| 209 | </para>
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| 210 |
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| 211 | <para>
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| 212 | Alternatively, you can install whole package which includes the client,
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| 213 | server, relay, static libraries and development headers by running the
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| 214 | following commands as the
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| 215 | <systemitem class="username">root</systemitem> user:
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| 216 | </para>
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| 217 |
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| 218 | <screen role="root"><userinput>make install &&
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| 219 | mv -v /usr/sbin/dhclient /sbin &&
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| 220 | install -v -m755 client/scripts/linux /sbin/dhclient-script</userinput></screen>
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| 221 |
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| 222 | </sect2>
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| 223 |
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| 224 | <sect2 role="configuration">
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| 225 | <title>Configuring ISC DHCP</title>
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| 226 |
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| 227 | <sect3 id="dhcp-config">
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| 228 | <title>Config Files</title>
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| 229 |
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| 230 | <para>
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| 231 | <filename>/etc/dhcp/dhclient.conf</filename> and
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| 232 | <filename>/etc/dhcp/dhcpd.conf</filename>
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| 233 | </para>
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| 234 |
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| 235 | <indexterm zone="dhcp dhcp-config">
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| 236 | <primary sortas="e-etc-dhcp-dhclient.conf">/etc/dhcp/dhclient.conf</primary>
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| 237 | </indexterm>
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| 238 |
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| 239 | <indexterm zone="dhcp dhcp-config">
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| 240 | <primary sortas="e-etc-dhcp-dhcpd.conf">/etc/dhcp/dhcpd.conf</primary>
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| 241 | </indexterm>
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| 242 |
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| 243 | </sect3>
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| 244 |
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| 245 | <sect3 id="dhclient-config">
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| 246 | <title>Client Configuration</title>
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| 247 |
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| 248 | <para>
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| 249 | Create basic <filename>/etc/dhcp/dhclient.conf</filename>
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| 250 | by running the following command as the
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| 251 | <systemitem class="username">root</systemitem> user:
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| 252 | </para>
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| 253 |
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| 254 | <screen role="root"><userinput>cat > /etc/dhcp/dhclient.conf << "EOF"
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| 255 | <literal># Begin /etc/dhcp/dhclient.conf
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| 256 | #
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| 257 | # Basic dhclient.conf(5)
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| 258 |
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| 259 | #prepend domain-name-servers 127.0.0.1;
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| 260 | request subnet-mask, broadcast-address, time-offset, routers,
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| 261 | domain-name, domain-name-servers, domain-search, host-name,
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| 262 | netbios-name-servers, netbios-scope, interface-mtu,
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| 263 | ntp-servers;
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| 264 | require subnet-mask, domain-name-servers;
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| 265 | #timeout 60;
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| 266 | #retry 60;
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| 267 | #reboot 10;
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| 268 | #select-timeout 5;
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| 269 | #initial-interval 2;
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| 270 |
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| 271 | # End /etc/dhcp/dhclient.conf</literal>
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| 272 | EOF</userinput></screen>
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| 273 |
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| 274 | <para>
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| 275 | See <command>man 5 dhclient.conf</command> for additional options.
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| 276 | </para>
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| 277 |
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| 278 | <para>
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| 279 | Now create the <filename class="directory">/var/lib/dhclient</filename>
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| 280 | directory which will contain DHCP Client leases by running the following
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| 281 | command as the <systemitem class="username">root</systemitem> user:
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| 282 | </para>
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| 283 |
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| 284 | <screen role="root"><userinput>install -v -dm 755 /var/lib/dhclient</userinput></screen>
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| 285 |
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| 286 | <para>
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| 287 | If you want to configure network interfaces at boot using
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| 288 | <command>dhclient</command>, you need to install the
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| 289 | systemd unit included in <xref linkend="bootscripts"/>
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| 290 | package by running the following command as the
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| 291 | <systemitem class="username">root</systemitem> user:
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| 292 | </para>
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| 293 |
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| 294 | <screen role="root"><userinput>make install-dhclient</userinput></screen>
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| 295 |
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| 296 | <indexterm zone="dhcp dhclient-config">
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| 297 | <primary sortas="f-dhclient">dhclient</primary>
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| 298 | </indexterm>
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| 299 |
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| 300 | <para>
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| 301 | At this point you can test if <command>dhclient</command> is
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| 302 | behaving as expected by running the following command as the
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| 303 | <systemitem class="username">root</systemitem> user:
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| 304 | </para>
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| 305 |
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| 306 | <screen role="root"><userinput>systemctl start dhclient@<replaceable>eth0</replaceable></userinput></screen>
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| 307 |
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| 308 | <para>
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| 309 | To start <command>dhclient</command> on a specific interface
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| 310 | at boot, enable the previously installed systemd unit by
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| 311 | running the following command as the
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| 312 | <systemitem class="username">root</systemitem> user:
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| 313 | </para>
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| 314 |
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| 315 | <screen role="root"><userinput>systemctl enable dhclient@<replaceable>eth0</replaceable></userinput></screen>
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| 316 |
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| 317 | <para>
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| 318 | Replace <replaceable>eth0</replaceable> with the actual interface name.
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| 319 | </para>
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| 320 |
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| 321 | </sect3>
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| 322 |
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| 323 | <sect3 id="dhcpd-config">
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| 324 | <title>Server Configuration</title>
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| 325 |
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| 326 | <para>
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| 327 | Note that you only need the DHCP server if you want to issue
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| 328 | LAN addresses over your network. The DHCP client doesn't need
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| 329 | the server in order to function properly.
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| 330 | </para>
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| 331 |
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| 332 | <para>
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| 333 | Start with creating <filename>/etc/dhcp/dhcpd.conf</filename>
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| 334 | by running the following command as the
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| 335 | <systemitem class="username">root</systemitem> user:
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| 336 | </para>
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| 337 |
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| 338 | <screen role="root"><userinput>cat > /etc/dhcp/dhcpd.conf << "EOF"
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| 339 | <literal># Begin /etc/dhcp/dhcpd.conf
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| 340 | #
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| 341 | # Example dhcpd.conf(5)
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| 342 |
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| 343 | # Use this to enble / disable dynamic dns updates globally.
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| 344 | ddns-update-style none;
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| 345 |
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| 346 | # option definitions common to all supported networks...
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| 347 | option domain-name "example.org";
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| 348 | option domain-name-servers ns1.example.org, ns2.example.org;
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| 349 |
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| 350 | default-lease-time 600;
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| 351 | max-lease-time 7200;
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| 352 |
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| 353 | # This is a very basic subnet declaration.
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| 354 | subnet 10.254.239.0 netmask 255.255.255.224 {
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| 355 | range 10.254.239.10 10.254.239.20;
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| 356 | option routers rtr-239-0-1.example.org, rtr-239-0-2.example.org;
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| 357 | }
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| 358 |
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| 359 | # End /etc/dhcp/dhcpd.conf</literal>
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| 360 | EOF</userinput></screen>
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| 361 |
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| 362 | <para>
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| 363 | Adjust the file to suit your needs. See
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| 364 | <command>man 5 dhcpd.conf</command> for additional options.
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| 365 | </para>
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| 366 |
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| 367 | <para>
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| 368 | Now create the <filename class="directory">/var/lib/dhcpd</filename>
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| 369 | directory which will contain DHCP Server leases by running the following
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| 370 | command as the <systemitem class="username">root</systemitem> user:
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| 371 | </para>
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| 372 |
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| 373 | <screen role="root"><userinput>install -v -dm 755 /var/lib/dhcpd</userinput></screen>
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| 374 |
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| 375 | <para>
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| 376 | To start the <command>dhcpd</command> daemon at boot,
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| 377 | install the systemd unit from the <xref linkend="bootscripts"/>
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| 378 | package by running the following command as the
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| 379 | <systemitem class="username">root</systemitem> user:
|
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| 380 | </para>
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| 381 |
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| 382 | <screen role="root"><userinput>make install-dhcpd</userinput></screen>
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| 383 |
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| 384 | <indexterm zone="dhcp dhcpd-config">
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| 385 | <primary sortas="f-dhcpd">dhcpd</primary>
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| 386 | </indexterm>
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| 387 |
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| 388 | <para>
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| 389 | You will need to edit the
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| 390 | <filename>/etc/default/dhcpd</filename> file in order
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| 391 | to set the interface on which <command>dhcpd</command>
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| 392 | will serve the DHCP requests.
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| 393 | </para>
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| 394 |
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| 395 | </sect3>
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| 396 |
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| 397 | </sect2>
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| 398 |
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| 399 | <sect2 role="content">
|
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| 400 | <title>Contents</title>
|
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| 401 |
|
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| 402 | <segmentedlist>
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| 403 | <segtitle>Installed Programs</segtitle>
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| 404 | <segtitle>Installed Libraries</segtitle>
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| 405 | <segtitle>Installed Directories</segtitle>
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| 406 |
|
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| 407 | <seglistitem>
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| 408 | <seg>
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| 409 | dhclient, dhclient-script, dhcpd, dhcrelay and omshell
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| 410 | </seg>
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| 411 | <seg>
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| 412 | libdhcpctl.a, libdst.a and libomapi.a
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| 413 | </seg>
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| 414 | <seg>
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| 415 | /etc/dhcp,
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| 416 | /usr/include/dhcpctl,
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| 417 | /usr/include/isc-dhcp,
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| 418 | /usr/include/omapip,
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| 419 | /var/lib/dhclient and
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| 420 | /var/lib/dhcpd
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| 421 | </seg>
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| 422 | </seglistitem>
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| 423 | </segmentedlist>
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| 424 |
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| 425 | <variablelist>
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| 426 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
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| 427 | <?dbfo list-presentation="list"?>
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| 428 | <?dbhtml list-presentation="table"?>
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| 429 |
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| 430 | <varlistentry id="dhclient">
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| 431 | <term><command>dhclient</command></term>
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| 432 | <listitem>
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| 433 | <para>
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| 434 | is the implementation of the DHCP client.
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| 435 | </para>
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| 436 | <indexterm zone="dhcp dhclient">
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| 437 | <primary sortas="b-dhclient">dhclient</primary>
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| 438 | </indexterm>
|
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| 439 | </listitem>
|
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| 440 | </varlistentry>
|
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| 441 |
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| 442 | <varlistentry id="dhclient-script">
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| 443 | <term><command>dhclient-script</command></term>
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| 444 | <listitem>
|
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| 445 | <para>
|
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| 446 | is used by dhclient to (re)configure interfaces. It can make
|
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| 447 | extra changes by invoking custom dhclient-{entry,exit}-hooks.
|
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| 448 | </para>
|
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| 449 | <indexterm zone="dhcp dhclient-script">
|
|---|
| 450 | <primary sortas="b-dhclient-script">dhclient-script</primary>
|
|---|
| 451 | </indexterm>
|
|---|
| 452 | </listitem>
|
|---|
| 453 | </varlistentry>
|
|---|
| 454 |
|
|---|
| 455 | <varlistentry id="dhcpd">
|
|---|
| 456 | <term><command>dhcpd</command></term>
|
|---|
| 457 | <listitem>
|
|---|
| 458 | <para>
|
|---|
| 459 | implements Dynamic Host Configuration Protocol (DHCP) and
|
|---|
| 460 | Internet Bootstrap Protocol (BOOTP) requests for network
|
|---|
| 461 | addresses.
|
|---|
| 462 | </para>
|
|---|
| 463 | <indexterm zone="dhcp dhcpd">
|
|---|
| 464 | <primary sortas="b-dhcpd">dhcpd</primary>
|
|---|
| 465 | </indexterm>
|
|---|
| 466 | </listitem>
|
|---|
| 467 | </varlistentry>
|
|---|
| 468 |
|
|---|
| 469 | <varlistentry id="dhcrelay">
|
|---|
| 470 | <term><command>dhcrelay</command></term>
|
|---|
| 471 | <listitem>
|
|---|
| 472 | <para>
|
|---|
| 473 | provides a means to accept DHCP and BOOTP requests on a subnet
|
|---|
| 474 | without a DHCP server and relay them to a DHCP server on another
|
|---|
| 475 | subnet.
|
|---|
| 476 | </para>
|
|---|
| 477 | <indexterm zone="dhcp dhcrelay">
|
|---|
| 478 | <primary sortas="b-dhcrelay">dhcrelay</primary>
|
|---|
| 479 | </indexterm>
|
|---|
| 480 | </listitem>
|
|---|
| 481 | </varlistentry>
|
|---|
| 482 |
|
|---|
| 483 | <varlistentry id="omshell">
|
|---|
| 484 | <term><command>omshell</command></term>
|
|---|
| 485 | <listitem>
|
|---|
| 486 | <para>
|
|---|
| 487 | provides an interactive way to connect to, query and
|
|---|
| 488 | possibly change the ISC DHCP Server's state via OMAPI, the
|
|---|
| 489 | Object Management API.
|
|---|
| 490 | </para>
|
|---|
| 491 | <indexterm zone="dhcp omshell">
|
|---|
| 492 | <primary sortas="b-omshell">omshell</primary>
|
|---|
| 493 | </indexterm>
|
|---|
| 494 | </listitem>
|
|---|
| 495 | </varlistentry>
|
|---|
| 496 |
|
|---|
| 497 | </variablelist>
|
|---|
| 498 |
|
|---|
| 499 | </sect2>
|
|---|
| 500 |
|
|---|
| 501 | </sect1>
|
|---|
