[0931098] | 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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[6732c094] | 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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[0931098] | 4 | <!ENTITY % general-entities SYSTEM "../../general.ent">
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| 5 | %general-entities;
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[697cb83f] | 6 |
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[ac02266] | 7 | <!ENTITY dhcp-download-http " ">
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[697cb83f] | 8 | <!ENTITY dhcp-download-ftp "ftp://ftp.isc.org/isc/dhcp/&dhcp-version;/dhcp-&dhcp-version;.tar.gz">
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[8a999991] | 9 | <!ENTITY dhcp-md5sum "b3a42ece3c7f2cd2e74a3e12ca881d20">
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[03f254d] | 10 | <!ENTITY dhcp-size "8.6 MB">
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[8a999991] | 11 | <!ENTITY dhcp-buildsize "109 MB">
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| 12 | <!ENTITY dhcp-time "0.4 SBU">
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[0931098] | 13 | ]>
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| 14 |
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[40330fcd] | 15 | <sect1 id="dhcp" xreflabel="DHCP-&dhcp-version;">
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[6ad98e12] | 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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[697cb83f] | 26 | <primary sortas="a-DHCP">DHCP</primary>
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[6ad98e12] | 27 | </indexterm>
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| 28 |
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| 29 | <sect2 role="package">
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[697cb83f] | 30 | <title>Introduction to ISC DHCP</title>
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[6ad98e12] | 31 |
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[697cb83f] | 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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[6ad98e12] | 39 |
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[7cadfea] | 40 | &lfs75_checked;
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[fa3e12e1] | 41 |
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[e198725] | 42 | <note>
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| 43 | <para>
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| 44 | Make sure you disable <command>systemd-networkd</command> service or
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| 45 | make it not configure the connections 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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[6ad98e12] | 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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[697cb83f] | 53 | <para>
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| 54 | Download (HTTP): <ulink url="&dhcp-download-http;"/>
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| 55 | </para>
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[6ad98e12] | 56 | </listitem>
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| 57 | <listitem>
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[697cb83f] | 58 | <para>
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| 59 | Download (FTP): <ulink url="&dhcp-download-ftp;"/>
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| 60 | </para>
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[6ad98e12] | 61 | </listitem>
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| 62 | <listitem>
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[697cb83f] | 63 | <para>
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| 64 | Download MD5 sum: &dhcp-md5sum;
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| 65 | </para>
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[6ad98e12] | 66 | </listitem>
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| 67 | <listitem>
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[697cb83f] | 68 | <para>
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| 69 | Download size: &dhcp-size;
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| 70 | </para>
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[6ad98e12] | 71 | </listitem>
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| 72 | <listitem>
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[697cb83f] | 73 | <para>
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| 74 | Estimated disk space required: &dhcp-buildsize;
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| 75 | </para>
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[6ad98e12] | 76 | </listitem>
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| 77 | <listitem>
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[697cb83f] | 78 | <para>
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| 79 | Estimated build time: &dhcp-time;
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| 80 | </para>
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[6ad98e12] | 81 | </listitem>
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| 82 | </itemizedlist>
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| 83 |
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[413bf97] | 84 | <bridgehead renderas="sect3">Additional Downloads</bridgehead>
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[697cb83f] | 85 | <itemizedlist spacing="compact">
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[b89d0335] | 86 | <listitem>
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[697cb83f] | 87 | <para>
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[54f740f] | 88 | Required patch:
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[8a999991] | 89 | <ulink url="&patch-root;/dhcp-&dhcp-version;-client_script-1.patch"/>
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[697cb83f] | 90 | </para>
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[b89d0335] | 91 | </listitem>
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[413bf97] | 92 | <listitem>
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[697cb83f] | 93 | <para>
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[54f740f] | 94 | Optional patch:
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[697cb83f] | 95 | <ulink url="&patch-root;/dhcp-&dhcp-version;-missing_ipv6-1.patch"/>
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| 96 | </para>
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[413bf97] | 97 | </listitem>
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| 98 | </itemizedlist>
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| 99 |
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[3cb0c57] | 100 | <para condition="html" role="usernotes">User Notes:
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[697cb83f] | 101 | <ulink url="&blfs-wiki;/dhcp"/>
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| 102 | </para>
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[6ad98e12] | 103 | </sect2>
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| 104 |
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[697cb83f] | 105 | <sect2 role="kernel" id="dhcp-kernel">
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[6ad98e12] | 106 | <title>Kernel Configuration</title>
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| 107 |
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[697cb83f] | 108 | <para>
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| 109 | You must have Packet Socket support (Networking Support ⇒
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| 110 | Networking Options ⇒ Packet Socket) compiled into the kernel.
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| 111 | If you do not have IPv6 support (Networking Support ⇒
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| 112 | Networking Options ⇒ The IPv6 Protocol) compiled in, then you
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| 113 | must use the missing_ipv6 patch.
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| 114 | </para>
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[6ad98e12] | 115 |
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| 116 | <indexterm zone="dhcp dhcp-kernel">
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[697cb83f] | 117 | <primary sortas="d-DHCP">DHCP</primary>
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[6ad98e12] | 118 | </indexterm>
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| 119 |
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| 120 | </sect2>
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| 121 |
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| 122 | <sect2 role="installation">
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[697cb83f] | 123 | <title>Installation of ISC DHCP</title>
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[6ad98e12] | 124 |
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[697cb83f] | 125 | <para>
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| 126 | If you have not compiled IPv6 support into the kernel, apply the
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| 127 | missing_ipv6 patch:
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| 128 | </para>
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[b89d0335] | 129 |
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[fa3e12e1] | 130 | <screen><userinput>patch -Np1 -i ../dhcp-&dhcp-version;-missing_ipv6-1.patch</userinput></screen>
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[b89d0335] | 131 |
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[b33c421] | 132 | <note>
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| 133 | <para>
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| 134 | Be careful with the instructions below. The single and
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| 135 | double quotes are important beecause the defined
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| 136 | variables are used verbatim in the code.
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| 137 | </para>
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| 138 | </note>
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[76b71ab] | 139 |
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[b33c421] | 140 | <para>
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| 141 | Install <application>ISC DHCP</application> by running
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| 142 | the following commands:
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| 143 | </para>
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[6ad98e12] | 144 |
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[8a999991] | 145 | <screen><userinput>patch -Np1 -i ../dhcp-&dhcp-version;-client_script-1.patch &&
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[697cb83f] | 146 | CFLAGS="-D_PATH_DHCLIENT_SCRIPT='\"/sbin/dhclient-script\"' \
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| 147 | -D_PATH_DHCPD_CONF='\"/etc/dhcp/dhcpd.conf\"' \
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| 148 | -D_PATH_DHCLIENT_CONF='\"/etc/dhcp/dhclient.conf\"'" \
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| 149 | ./configure --prefix=/usr \
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| 150 | --sysconfdir=/etc/dhcp \
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| 151 | --localstatedir=/var \
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| 152 | --with-srv-lease-file=/var/lib/dhcpd/dhcpd.leases \
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| 153 | --with-srv6-lease-file=/var/lib/dhcpd/dhcpd6.leases \
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| 154 | --with-cli-lease-file=/var/lib/dhclient/dhclient.leases \
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| 155 | --with-cli6-lease-file=/var/lib/dhclient/dhclient6.leases &&
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| 156 | make</userinput></screen>
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| 157 |
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| 158 | <para>
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| 159 | To test the results, issue: <command>make check</command>
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| 160 | </para>
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| 161 |
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| 162 | <para>
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| 163 | If you only want to install the <application>ISC DHCP</application> client,
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| 164 | issue the following commands as the
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| 165 | <systemitem class="username">root</systemitem> user:
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| 166 | </para>
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| 167 |
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| 168 | <screen role="root"><userinput>make -C client install &&
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| 169 | mv -v /usr/sbin/dhclient /sbin &&
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| 170 | install -v -m755 client/scripts/linux /sbin/dhclient-script</userinput></screen>
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[fa3e12e1] | 171 |
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[697cb83f] | 172 | <para>
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| 173 | Skip to <xref linkend="dhclient-config"/> in order to configure the client
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| 174 | </para>
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[6ad98e12] | 175 |
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[697cb83f] | 176 | <para>
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| 177 | If you only want to install the <application>ISC DHCP</application> server,
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| 178 | issue the following command as the
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| 179 | <systemitem class="username">root</systemitem> user:
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| 180 | </para>
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[fa3e12e1] | 181 |
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[697cb83f] | 182 | <screen role="root"><userinput>make -C server install</userinput></screen>
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[fa3e12e1] | 183 |
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[697cb83f] | 184 | <para>
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| 185 | Skip to <xref linkend="dhcpd-config"/> in order to configure the server.
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| 186 | </para>
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[275b1da] | 187 |
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[697cb83f] | 188 | <para>
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| 189 | Alternatively, you can install whole package which includes the client,
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| 190 | server, relay, static libraries and development headers by running the
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| 191 | following commands as the
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| 192 | <systemitem class="username">root</systemitem> user:
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| 193 | </para>
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[04a6794] | 194 |
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[697cb83f] | 195 | <screen role="root"><userinput>make install &&
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| 196 | mv -v /usr/sbin/dhclient /sbin &&
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[ac02266] | 197 | install -v -m755 client/scripts/linux /sbin/dhclient-script</userinput></screen>
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[fa3e12e1] | 198 |
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[697cb83f] | 199 | </sect2>
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[fa3e12e1] | 200 |
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[697cb83f] | 201 | <sect2 role="configuration">
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| 202 | <title>Configuring ISC DHCP</title>
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[fa3e12e1] | 203 |
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[697cb83f] | 204 | <sect3 id="dhcp-config">
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| 205 | <title>Config Files</title>
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[fa3e12e1] | 206 |
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[697cb83f] | 207 | <para>
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| 208 | <filename>/etc/dhcp/dhclient.conf</filename> and
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| 209 | <filename>/etc/dhcp/dhcpd.conf</filename>
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| 210 | </para>
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[0931098] | 211 |
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[697cb83f] | 212 | <indexterm zone="dhcp dhcp-config">
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| 213 | <primary sortas="e-etc-dhcp-dhclient.conf">/etc/dhcp/dhclient.conf</primary>
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| 214 | </indexterm>
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[0931098] | 215 |
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[697cb83f] | 216 | <indexterm zone="dhcp dhcp-config">
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| 217 | <primary sortas="e-etc-dhcp-dhcpd.conf">/etc/dhcp/dhcpd.conf</primary>
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| 218 | </indexterm>
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[0931098] | 219 |
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[697cb83f] | 220 | </sect3>
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[fa3e12e1] | 221 |
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[697cb83f] | 222 | <sect3 id="dhclient-config">
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| 223 | <title>Client Configuration</title>
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| 224 |
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| 225 | <para>
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| 226 | Create basic <filename>/etc/dhcp/dhclient.conf</filename>
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| 227 | by running the following command as the
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| 228 | <systemitem class="username">root</systemitem> user:
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| 229 | </para>
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| 230 |
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| 231 | <screen role="root"><userinput>cat > /etc/dhcp/dhclient.conf << "EOF"
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| 232 | <literal># Begin /etc/dhcp/dhclient.conf
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| 233 | #
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| 234 | # Basic dhclient.conf(5)
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| 235 |
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| 236 | #prepend domain-name-servers 127.0.0.1;
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| 237 | request subnet-mask, broadcast-address, time-offset, routers,
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| 238 | domain-name, domain-name-servers, domain-search, host-name,
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| 239 | netbios-name-servers, netbios-scope, interface-mtu,
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| 240 | ntp-servers;
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| 241 | require subnet-mask, domain-name-servers;
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| 242 | #timeout 60;
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| 243 | #retry 60;
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| 244 | #reboot 10;
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| 245 | #select-timeout 5;
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| 246 | #initial-interval 2;
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| 247 |
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| 248 | # End /etc/dhcp/dhclient.conf</literal>
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| 249 | EOF</userinput></screen>
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[fa3e12e1] | 250 |
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[697cb83f] | 251 | <para>
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| 252 | See <command>man 5 dhclient.conf</command> for additional options.
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| 253 | </para>
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[fa3e12e1] | 254 |
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[697cb83f] | 255 | <para>
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| 256 | Now create the <filename class="directory">/var/lib/dhclient</filename>
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| 257 | directory which will contain DHCP Client leases by running the following
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| 258 | command as the <systemitem class="username">root</systemitem> user:
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| 259 | </para>
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[fa3e12e1] | 260 |
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[697cb83f] | 261 | <screen role="root"><userinput>install -v -dm 755 /var/lib/dhclient</userinput></screen>
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[fa3e12e1] | 262 |
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[ee4502d4] | 263 | <para>
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| 264 | If you want to configure network interfaces at boot using
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| 265 | <command>dhclient</command>, you need to install the
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| 266 | systemd unit included in <xref linkend="bootscripts"/>
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| 267 | package by running the following command as the
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| 268 | <systemitem class="username">root</systemitem> user:
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| 269 | </para>
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| 270 |
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| 271 | <screen role="root"><userinput>make install-dhclient</userinput></screen>
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| 272 |
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| 273 | <indexterm zone="dhcp dhclient-config">
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| 274 | <primary sortas="f-dhclient">dhclient</primary>
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| 275 | </indexterm>
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| 276 |
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[697cb83f] | 277 | <para>
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| 278 | At this point you can test if <command>dhclient</command> is
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| 279 | behaving as expected by running the following command as the
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| 280 | <systemitem class="username">root</systemitem> user:
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| 281 | </para>
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[0931098] | 282 |
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[ee4502d4] | 283 | <screen role="root"><userinput>systemctl start dhclient@<replaceable>eth0</replaceable></userinput></screen>
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| 284 |
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| 285 | <para>
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| 286 | To start <command>dhclient</command> on a specific interface
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| 287 | at boot, enable the previously installed systemd unit by
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| 288 | running the following command as the
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| 289 | <systemitem class="username">root</systemitem> user:
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| 290 | </para>
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| 291 |
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| 292 | <screen role="root"><userinput>systemctl enable dhclient@<replaceable>eth0</replaceable></userinput></screen>
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| 293 |
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| 294 | <para>
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| 295 | Replace <replaceable>eth0</replaceable> with the actual interface name.
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| 296 | </para>
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[0931098] | 297 |
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[697cb83f] | 298 | </sect3>
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[0931098] | 299 |
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[697cb83f] | 300 | <sect3 id="dhcpd-config">
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| 301 | <title>Server Configuration</title>
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[4774914f] | 302 |
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[697cb83f] | 303 | <para>
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| 304 | Note that you only need the DHCP server if you want to issue
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| 305 | LAN addresses over your network. The DHCP client doesn't need
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| 306 | the server in order to function properly.
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| 307 | </para>
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[04a6794] | 308 |
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[697cb83f] | 309 | <para>
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| 310 | Start with creating <filename>/etc/dhcp/dhcpd.conf</filename>
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| 311 | by 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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[0931098] | 314 |
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[697cb83f] | 315 | <screen role="root"><userinput>cat > /etc/dhcp/dhcpd.conf << "EOF"
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| 316 | <literal># Begin /etc/dhcp/dhcpd.conf
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| 317 | #
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| 318 | # Example dhcpd.conf(5)
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[0931098] | 319 |
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[697cb83f] | 320 | # Use this to enble / disable dynamic dns updates globally.
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| 321 | ddns-update-style none;
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[0931098] | 322 |
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[697cb83f] | 323 | # option definitions common to all supported networks...
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| 324 | option domain-name "example.org";
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| 325 | option domain-name-servers ns1.example.org, ns2.example.org;
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[0931098] | 326 |
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[697cb83f] | 327 | default-lease-time 600;
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| 328 | max-lease-time 7200;
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[6ad98e12] | 329 |
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[697cb83f] | 330 | # This is a very basic subnet declaration.
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| 331 | subnet 10.254.239.0 netmask 255.255.255.224 {
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| 332 | range 10.254.239.10 10.254.239.20;
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| 333 | option routers rtr-239-0-1.example.org, rtr-239-0-2.example.org;
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| 334 | }
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[0931098] | 335 |
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[697cb83f] | 336 | # End /etc/dhcp/dhcpd.conf</literal>
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[6ad98e12] | 337 | EOF</userinput></screen>
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| 338 |
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[697cb83f] | 339 | <para>
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| 340 | Adjust the file to suit your needs. See
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| 341 | <command>man 5 dhcpd.conf</command> for additional options.
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| 342 | </para>
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| 343 |
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| 344 | <para>
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| 345 | Now create the <filename class="directory">/var/lib/dhcpd</filename>
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| 346 | directory which will contain DHCP Server leases by running the following
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| 347 | command as the <systemitem class="username">root</systemitem> user:
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| 348 | </para>
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| 349 |
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| 350 | <screen role="root"><userinput>install -v -dm 755 /var/lib/dhcpd</userinput></screen>
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| 351 |
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[932240d] | 352 | <para>
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| 353 | To start the <command>dhcpd</command> daemon at boot,
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| 354 | install the systemd unit from the <xref linkend="bootscripts"/>
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| 355 | package by running the following command as the
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| 356 | <systemitem class="username">root</systemitem> user:
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[697cb83f] | 357 | </para>
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| 358 |
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| 359 | <screen role="root"><userinput>make install-dhcpd</userinput></screen>
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| 360 |
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| 361 | <indexterm zone="dhcp dhcpd-config">
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| 362 | <primary sortas="f-dhcpd">dhcpd</primary>
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| 363 | </indexterm>
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| 364 |
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| 365 | <para>
|
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| 366 | You will need to edit the
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[932240d] | 367 | <filename>/etc/default/dhcpd</filename> file in order
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[697cb83f] | 368 | to set the interface on which <command>dhcpd</command>
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| 369 | will serve the DHCP requests.
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| 370 | </para>
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[6ad98e12] | 371 |
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| 372 | </sect3>
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| 373 |
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| 374 | </sect2>
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| 375 |
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| 376 | <sect2 role="content">
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| 377 | <title>Contents</title>
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| 378 |
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| 379 | <segmentedlist>
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| 380 | <segtitle>Installed Programs</segtitle>
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| 381 | <segtitle>Installed Libraries</segtitle>
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| 382 | <segtitle>Installed Directories</segtitle>
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| 383 |
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| 384 | <seglistitem>
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[697cb83f] | 385 | <seg>
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| 386 | dhclient, dhclient-script, dhcpd, dhcrelay and omshell
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| 387 | </seg>
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| 388 | <seg>
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| 389 | libdhcpctl.a, libdst.a and libomapi.a
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| 390 | </seg>
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| 391 | <seg>
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[03f254d] | 392 | /etc/dhcp,
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[697cb83f] | 393 | /usr/include/dhcpctl,
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| 394 | /usr/include/isc-dhcp,
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| 395 | /usr/include/omapip,
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| 396 | /var/lib/dhclient and
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| 397 | /var/lib/dhcpd
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| 398 | </seg>
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[6ad98e12] | 399 | </seglistitem>
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| 400 | </segmentedlist>
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| 401 |
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| 402 | <variablelist>
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| 403 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
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| 404 | <?dbfo list-presentation="list"?>
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| 405 | <?dbhtml list-presentation="table"?>
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| 406 |
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| 407 | <varlistentry id="dhclient">
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| 408 | <term><command>dhclient</command></term>
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| 409 | <listitem>
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[697cb83f] | 410 | <para>
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| 411 | is the implementation of the DHCP client.
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| 412 | </para>
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[6ad98e12] | 413 | <indexterm zone="dhcp dhclient">
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| 414 | <primary sortas="b-dhclient">dhclient</primary>
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| 415 | </indexterm>
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| 416 | </listitem>
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| 417 | </varlistentry>
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| 418 |
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[fa3e12e1] | 419 | <varlistentry id="dhclient-script">
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| 420 | <term><command>dhclient-script</command></term>
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| 421 | <listitem>
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[697cb83f] | 422 | <para>
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| 423 | is used by dhclient to (re)configure interfaces. It can make
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| 424 | extra changes by invoking custom dhclient-{entry,exit}-hooks.
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| 425 | </para>
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[fa3e12e1] | 426 | <indexterm zone="dhcp dhclient-script">
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| 427 | <primary sortas="b-dhclient-script">dhclient-script</primary>
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| 428 | </indexterm>
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| 429 | </listitem>
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| 430 | </varlistentry>
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| 431 |
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[6ad98e12] | 432 | <varlistentry id="dhcpd">
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| 433 | <term><command>dhcpd</command></term>
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| 434 | <listitem>
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[697cb83f] | 435 | <para>
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| 436 | implements Dynamic Host Configuration Protocol (DHCP) and
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| 437 | Internet Bootstrap Protocol (BOOTP) requests for network
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| 438 | addresses.
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| 439 | </para>
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[6ad98e12] | 440 | <indexterm zone="dhcp dhcpd">
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| 441 | <primary sortas="b-dhcpd">dhcpd</primary>
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| 442 | </indexterm>
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| 443 | </listitem>
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| 444 | </varlistentry>
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| 445 |
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| 446 | <varlistentry id="dhcrelay">
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| 447 | <term><command>dhcrelay</command></term>
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| 448 | <listitem>
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[697cb83f] | 449 | <para>
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| 450 | provides a means to accept DHCP and BOOTP requests on a subnet
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| 451 | without a DHCP server and relay them to a DHCP server on another
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| 452 | subnet.
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| 453 | </para>
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[6ad98e12] | 454 | <indexterm zone="dhcp dhcrelay">
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| 455 | <primary sortas="b-dhcrelay">dhcrelay</primary>
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| 456 | </indexterm>
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| 457 | </listitem>
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| 458 | </varlistentry>
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| 459 |
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| 460 | <varlistentry id="omshell">
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| 461 | <term><command>omshell</command></term>
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| 462 | <listitem>
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[697cb83f] | 463 | <para>
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| 464 | provides an interactive way to connect to, query and
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| 465 | possibly change the ISC DHCP Server's state via OMAPI, the
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| 466 | Object Management API.
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| 467 | </para>
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[6ad98e12] | 468 | <indexterm zone="dhcp omshell">
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| 469 | <primary sortas="b-omshell">omshell</primary>
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| 470 | </indexterm>
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| 471 | </listitem>
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| 472 | </varlistentry>
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| 473 |
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| 474 | </variablelist>
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| 475 |
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| 476 | </sect2>
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[04a6794] | 477 |
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[f45b1953] | 478 | </sect1>
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