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 | <!-- isc have a weird way of offering the tarballs and without dots in version!
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7 | FIXME - change hardcoded 423s in http url and version in ftp when upgrading -->
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8 | <!ENTITY dhcp-download-http " ">
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9 | <!ENTITY dhcp-download-ftp "ftp://ftp.isc.org/isc/dhcp/&dhcp-version;/dhcp-&dhcp-version;.tar.gz">
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10 | <!ENTITY dhcp-md5sum "14f57fd580d01633d0fad4809007a801">
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11 | <!ENTITY dhcp-size "9.1 MB">
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12 | <!ENTITY dhcp-buildsize "192 MB (client and server), 140MB client only, 172MB server only">
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13 | <!ENTITY dhcp-time "0.7 SBU (client and server, or server), 0.6 SBU client only ">
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14 | ]>
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15 |
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16 | <sect1 id="dhcp" xreflabel="DHCP-&dhcp-version;">
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17 | <?dbhtml filename="dhcp.html"?>
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18 |
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19 | <sect1info>
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20 | <othername>$LastChangedBy$</othername>
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21 | <date>$Date$</date>
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22 | </sect1info>
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23 |
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24 | <title>DHCP-&dhcp-version;</title>
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25 |
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26 | <indexterm zone="dhcp">
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27 | <primary sortas="a-dhcp">Dhcp</primary>
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28 | </indexterm>
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29 |
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30 | <sect2 role="package">
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31 | <title>Introduction to DHCP</title>
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32 |
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33 | <para>The <application>DHCP</application> package contains both the client
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34 | and server programs for DHCP. <command>dhclient</command> (the client) is
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35 | useful for connecting your computer to a network which uses DHCP to assign
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36 | network addresses. <command>dhcpd</command> (the server) is useful for
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37 | assigning network addresses on your private network.</para>
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38 |
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39 | &lfs70_checked;
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40 |
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41 | <bridgehead renderas="sect3">Package Information</bridgehead>
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42 | <itemizedlist spacing="compact">
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43 | <listitem>
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44 | <para>Download (HTTP): <ulink url="&dhcp-download-http;"/></para>
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45 | </listitem>
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46 | <listitem>
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47 | <para>Download (FTP): <ulink url="&dhcp-download-ftp;"/></para>
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48 | </listitem>
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49 | <listitem>
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50 | <para>Download MD5 sum: &dhcp-md5sum;</para>
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51 | </listitem>
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52 | <listitem>
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53 | <para>Download size: &dhcp-size;</para>
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54 | </listitem>
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55 | <listitem>
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56 | <para>Estimated disk space required: &dhcp-buildsize;</para>
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57 | </listitem>
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58 | <listitem>
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59 | <para>Estimated build time: &dhcp-time;</para>
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60 | </listitem>
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61 | </itemizedlist>
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62 |
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63 | <bridgehead renderas="sect3">Additional Downloads</bridgehead>
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64 | <itemizedlist spacing='compact'>
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65 | <listitem>
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66 | <para>Recommended Patch (for client):
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67 | <ulink url="&patch-root;/dhcp-&dhcp-version;-iproute2-1.patch"/></para>
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68 | </listitem>
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69 | <listitem>
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70 | <para>Optional Patch:
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71 | <ulink url="&patch-root;/dhcp-&dhcp-version;-missing_ipv6-1.patch"/></para>
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72 | </listitem>
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73 | </itemizedlist>
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74 |
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75 | <bridgehead renderas="sect3">DHCP Dependencies</bridgehead>
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76 |
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77 | <bridgehead renderas="sect4">Required</bridgehead>
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78 | <para role="required"><xref linkend="net-tools"/> is required at runtime
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79 | by <command>dhclient</command> if you do not use the iproute2 patch.</para>
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80 |
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81 | <para condition="html" role="usernotes">User Notes:
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82 | <ulink url="&blfs-wiki;/dhcp"/></para>
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83 |
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84 | </sect2>
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85 |
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86 | <sect2 role="kernel" id='dhcp-kernel'>
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87 | <title>Kernel Configuration</title>
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88 |
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89 | <para>You must have Packet Socket support (Networking
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90 | Support ⇒ Networking Options ⇒ Packet Socket) compiled into
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91 | the kernel. If you do not have IPv6 support (Networking Support ⇒
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92 | Networking Options ⇒ The IPv6 Protocol) compiled in, then you
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93 | must use the missing_ipv6 patch.</para>
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94 |
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95 | <indexterm zone="dhcp dhcp-kernel">
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96 | <primary sortas="d-dhcp">DHCP</primary>
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97 | </indexterm>
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98 |
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99 | </sect2>
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100 |
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101 | <sect2 role="installation">
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102 | <title>Installation of DHCP</title>
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103 |
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104 | <para>If you have not compiled IPv6 support into the kernel, apply the
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105 | missing_ipv6 patch</para>
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106 |
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107 | <screen><userinput>patch -Np1 -i ../dhcp-&dhcp-version;-missing_ipv6-1.patch</userinput></screen>
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108 |
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109 | <para>If you are installing the client, apply the iproute2 patch unless you
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110 | will have installed <application>net-tools</application> by the time you wish
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111 | to use the client:</para>
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112 |
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113 | <screen><userinput>patch -Np1 -i ../dhcp-&dhcp-version;-iproute2-1.patch</userinput></screen>
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114 |
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115 | <para>Install <application>DHCP</application> by running
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116 | the following commands:</para>
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117 |
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118 | <screen><userinput>sed -i 's%\(^sbindir =\).*%\1 @prefix@@sbindir@%' server/Makefile.in &&
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119 | ./configure --prefix=/usr --sysconfdir=/etc --localstatedir=/var \
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120 | --sbindir=/sbin \
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121 | --with-srv-lease-file=/var/state/dhcp/dhcpd.leases \
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122 | --with-srv6-lease-file=/var/state/dhcp/dhcpd6.leases \
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123 | --with-cli-lease-file=/var/state/dhclient.leases \
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124 | --with-cli6-lease-file=/var/state/dhclient6.leases &&
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125 | sed -i 's/-Werror//' {client,common,dst,omapip,relay,server,tests}/Makefile</userinput></screen>
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126 |
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127 | <para>If you only wish to build the server, enter:</para>
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128 | <screen><userinput>sed -i 's/ client//' Makefile</userinput></screen>
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129 |
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130 | <para>If you only wish to build the client, enter:</para>
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131 | <screen><userinput>sed -i 's/ dhcpctl relay server//' Makefile</userinput></screen>
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132 |
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133 | <para>Build your chosen variant(s) with:</para>
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134 | <screen><userinput>make</userinput></screen>
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135 |
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136 | <para>To test the results, issue: <command>make check</command></para>
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137 |
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138 | <para>Now, as the <systemitem class="username">root</systemitem> user:</para>
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139 |
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140 | <screen role="root"><userinput>make install &&
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141 | install -v -m755 client/scripts/linux /sbin/dhclient-script</userinput></screen>
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142 |
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143 | <para>The supplied <filename>/etc/dhcpd.conf</filename> (server) and
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144 | <filename>/etc/dhclient.conf</filename> (client) are examples for a
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145 | specific <literal>BSD</literal> system. They are unlikely to be appropriate
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146 | to your needs, but you may wish to read them for ideas before deleting them
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147 | or moving them to a different location.</para>
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148 |
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149 | <para>Now create any needed directories for the leases.</para>
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150 |
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151 | <para>For the server:</para>
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152 |
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153 | <screen role="root"><userinput>mkdir -pv /var/state/dhcp</userinput></screen>
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154 |
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155 | <para>For the client:</para>
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156 | <screen role="root"><userinput>mkdir -pv /var/state</userinput></screen>
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157 |
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158 | </sect2>
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159 |
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160 | <sect2 role="commands">
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161 | <title>Command Explanations</title>
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162 |
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163 | <para><command>sed -i 's%\(^sbindir =\).*%\1 @prefix@@sbindir@%' server/Makefile.in</command>
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164 | This command moves the <command>dhcp</command> program to
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165 | <filename class='directory'>/usr/sbin</filename> instead of
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166 | <filename class='directory'>/sbin</filename> because it is not needed
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167 | while the server is booting.</para>
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168 |
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169 | <para><command>--sbindir=/sbin</command> The <command>dhclient</command>
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170 | program is moved to <filename class='directory'>/sbin</filename> instead of
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171 | <filename class='directory'>/usr/sbin</filename> so that it is available
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172 | during boot, e.g. if <filename class='directory'>/usr</filename> is to be
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173 | an <literal>nfs</literal> mount.</para>
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174 |
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175 | <para><command>--with-*-lease-files=...</command> By default, lease files
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176 | are placed in <filename class='directory'>/var/db</filename> which is an
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177 | anachronism.</para>
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178 |
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179 | <para><command>sed -i 's/-Werror//' {client,common,...}/Makefile</command> -
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180 | the Makefiles in this package add <literal>-Werror</literal> to the
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181 | <literal>CFLAGS</literal>. On recent versions of <application>gcc</application>
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182 | more things, particularly unused variables, create warnings. The
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183 | <literal>-Werror</literal> flag causes warnings to break the build, so we
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184 | remove it where necessary.</para>
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185 |
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186 | <para><command>sed -i 's/ something//' Makefile</command> - this stops the
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187 | build from entering the director(y,ies) named here.</para>
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188 |
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189 | <para><option>rm -v /usr/lib/lib{dhcpctl,dst,omapi}.a</option> - there is
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190 | no easy way to prevent these static libraries being installed, but they are
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191 | only needed during the build of this package. <filename>libdhcpctl.a</filename>
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192 | is only installed if you build the server.</para>
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193 |
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194 | </sect2>
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195 |
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196 | <sect2 role="configuration">
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197 | <title>Configuring DHCP</title>
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198 |
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199 | <sect3 id='dhcp-config'>
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200 | <title>Config Files</title>
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201 |
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202 | <para><filename>/etc/dhclient.conf</filename> and
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203 | <filename>/etc/dhcpd.conf</filename></para>
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204 |
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205 | <indexterm zone="dhcp dhcp-config">
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206 | <primary sortas="e-etc-dhclient.conf">/etc/dhclient.conf</primary>
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207 | </indexterm>
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208 |
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209 | <indexterm zone="dhcp dhcp-config">
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210 | <primary sortas="e-etc-dhcpd.conf">/etc/dhcpd.conf</primary>
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211 | </indexterm>
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212 |
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213 | </sect3>
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214 |
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215 | <sect3 id='dhcp-init'>
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216 | <title>Configuration Information</title>
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217 |
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218 | <para>Information on configuring the DHCP client can be
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219 | found in <xref linkend="basicnet-connect"/>.</para>
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220 |
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221 | <para>Note that you only need the DHCP server if you want to issue
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222 | LAN addresses over your network. The DHCP client doesn't need this
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223 | script to be used. Also note that this script is coded for the
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224 | <emphasis role="strong">eth1</emphasis> interface, which may need
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225 | to be modified for your hardware configuration.</para>
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226 |
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227 | <para>Install the <filename>/etc/rc.d/init.d/dhcp</filename>
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228 | init script included in the <xref linkend="bootscripts"/>
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229 | package.</para>
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230 |
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231 | <indexterm zone="dhcp dhcp-init">
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232 | <primary sortas="f-dhcp">dhcpd</primary>
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233 | </indexterm>
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234 |
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235 | <screen role="root"><userinput>make install-dhcp</userinput></screen>
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236 |
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237 | <para>The lease file must exist on startup. The following command will
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238 | satisfy that requirement:</para>
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239 |
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240 | <screen role="root"><userinput>touch /var/state/dhcp/dhcpd.leases</userinput></screen>
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241 |
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242 | <para>The following commands will create a base configuration file
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243 | for a DHCP server. There are several options that you may want to
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244 | add (information that is passed back to the DHCP client) and those
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245 | are covered in the man pages for <filename>dhcp.conf</filename>.</para>
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246 |
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247 | <screen role="root"><userinput>cat > /etc/dhcpd.conf << "EOF"
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248 | <literal>default-lease-time 72000;
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249 | max-lease-time 144000;
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250 |
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251 | subnet <replaceable><192.168.5.0></replaceable> netmask <replaceable><255.255.255.0></replaceable> {
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252 | range <replaceable><192.168.5.10> <192.168.5.240></replaceable>;
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253 | option broadcast-address <replaceable><192.168.5.255></replaceable>;
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254 | option routers <replaceable><192.168.5.1></replaceable>;
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255 | }</literal>
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256 | EOF</userinput></screen>
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257 |
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258 | <para>All addresses should be changed to meet your circumstance.</para>
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259 |
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260 | </sect3>
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261 |
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262 | </sect2>
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263 |
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264 | <sect2 role="content">
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265 | <title>Contents</title>
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266 |
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267 | <segmentedlist>
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268 | <segtitle>Installed Programs</segtitle>
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269 | <segtitle>Installed Libraries</segtitle>
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270 | <segtitle>Installed Directories</segtitle>
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271 |
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272 | <seglistitem>
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273 | <seg>dhcpd, dhcrelay, dhclient, dhclient-script, and omshell</seg>
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274 | <seg>libbdhcpctl.a, libdst.a, libomapi.a</seg>
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275 | <seg>/var/state/dhcp, /usr/include/omapip, and /usr/include/isi-dhcp</seg>
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276 | </seglistitem>
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277 | </segmentedlist>
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278 |
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279 | <variablelist>
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280 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
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281 | <?dbfo list-presentation="list"?>
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282 | <?dbhtml list-presentation="table"?>
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283 |
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284 | <varlistentry id="dhclient">
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285 | <term><command>dhclient</command></term>
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286 | <listitem>
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287 | <para>is the implementation of the DHCP client.</para>
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288 | <indexterm zone="dhcp dhclient">
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289 | <primary sortas="b-dhclient">dhclient</primary>
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290 | </indexterm>
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291 | </listitem>
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292 | </varlistentry>
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293 |
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294 | <varlistentry id="dhclient-script">
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295 | <term><command>dhclient-script</command></term>
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296 | <listitem>
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297 | <para>is used by dhclient to (re)configure interfaces. It can make
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298 | extra changes by invoking custom dhclient-{entry,exit}-hooks.</para>
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299 | <indexterm zone="dhcp dhclient-script">
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300 | <primary sortas="b-dhclient-script">dhclient-script</primary>
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301 | </indexterm>
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302 | </listitem>
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303 | </varlistentry>
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304 |
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305 | <varlistentry id="dhcpd">
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306 | <term><command>dhcpd</command></term>
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307 | <listitem>
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308 | <para>implements Dynamic Host Configuration Protocol (DHCP) and
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309 | Internet Bootstrap Protocol (BOOTP) requests for network
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310 | addresses.</para>
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311 | <indexterm zone="dhcp dhcpd">
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312 | <primary sortas="b-dhcpd">dhcpd</primary>
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313 | </indexterm>
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314 | </listitem>
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315 | </varlistentry>
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316 |
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317 | <varlistentry id="dhcrelay">
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318 | <term><command>dhcrelay</command></term>
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319 | <listitem>
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320 | <para>provides a means to accept DHCP and BOOTP requests on a subnet
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321 | without a DHCP server and relay them to a DHCP server on another
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322 | subnet.</para>
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323 | <indexterm zone="dhcp dhcrelay">
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324 | <primary sortas="b-dhcrelay">dhcrelay</primary>
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325 | </indexterm>
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326 | </listitem>
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327 | </varlistentry>
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328 |
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329 | <varlistentry id="omshell">
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330 | <term><command>omshell</command></term>
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331 | <listitem>
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332 | <para> provides an interactive way to connect to, query, and
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333 | possibly change, the ISC DHCP Server's state via OMAPI, the
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334 | Object Management API.</para>
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335 | <indexterm zone="dhcp omshell">
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336 | <primary sortas="b-omshell">omshell</primary>
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337 | </indexterm>
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338 | </listitem>
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339 | </varlistentry>
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340 |
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341 | </variablelist>
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342 |
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343 | </sect2>
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344 |
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345 | </sect1>
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