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 "https://ftp.isc.org/isc/dhcp/&dhcp-version;/dhcp-&dhcp-version;.tar.gz">
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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 "36c6ca77212373b0cff478ae9e5d32af">
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10 | <!ENTITY dhcp-size "9.6 MB">
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11 | <!ENTITY dhcp-buildsize "199 MB">
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12 | <!ENTITY dhcp-time "0.7 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 |
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19 | <title>DHCP-&dhcp-version;</title>
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20 |
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21 | <indexterm zone="dhcp">
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22 | <primary sortas="a-DHCP">DHCP</primary>
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23 | </indexterm>
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24 |
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25 | <sect2 role="package">
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26 | <title>Introduction to ISC DHCP</title>
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27 |
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28 | <para>
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29 | The <application>ISC DHCP</application> package contains both the client
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30 | and server programs for DHCP. <command>dhclient</command> (the client) is
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31 | used for connecting to a network which uses DHCP to assign network
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32 | addresses. <command>dhcpd</command> (the server) is used for assigning
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33 | network addresses on private networks.
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34 | </para>
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35 |
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36 | &lfs113_checked;
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37 |
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38 | <bridgehead renderas="sect3">Package Information</bridgehead>
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39 | <itemizedlist spacing="compact">
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40 | <listitem>
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41 | <para>
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42 | Download (HTTP): <ulink url="&dhcp-download-http;"/>
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43 | </para>
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44 | </listitem>
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45 | <listitem>
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46 | <para>
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47 | Download (FTP): <ulink url="&dhcp-download-ftp;"/>
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48 | </para>
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49 | </listitem>
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50 | <listitem>
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51 | <para>
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52 | Download MD5 sum: &dhcp-md5sum;
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53 | </para>
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54 | </listitem>
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55 | <listitem>
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56 | <para>
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57 | Download size: &dhcp-size;
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58 | </para>
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59 | </listitem>
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60 | <listitem>
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61 | <para>
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62 | Estimated disk space required: &dhcp-buildsize;
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63 | </para>
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64 | </listitem>
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65 | <listitem>
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66 | <para>
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67 | Estimated build time: &dhcp-time;
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68 | </para>
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69 | </listitem>
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70 | </itemizedlist>
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71 | <!--
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72 | <bridgehead renderas="sect3">Additional Downloads</bridgehead>
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73 | <itemizedlist spacing="compact">
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74 | <listitem>
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75 | <para>
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76 | Required patch:
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77 | <ulink url="&patch-root;/dhcp-&dhcp-version;-client_script-1.patch"/>
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78 | </para>
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79 | </listitem>
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80 | <listitem>
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81 | <para>
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82 | Optional patch:
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83 | <ulink url="&patch-root;/dhcp-&dhcp-version;-missing_ipv6-1.patch"/>
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84 | </para>
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85 | </listitem>
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86 | </itemizedlist>
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87 | -->
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88 | </sect2>
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89 |
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90 | <sect2 role="kernel" id="dhcp-kernel">
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91 | <title>Kernel Configuration</title>
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92 |
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93 | <para>
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94 | You must have Packet Socket support. IPv6 support is optional.
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95 | </para>
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96 |
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97 | <screen><literal>[*] Networking support ---> [CONFIG_NET]
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98 | Networking options --->
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99 | <*> Packet socket [CONFIG_PACKET]
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100 | <*> The IPv6 Protocol ---> [CONFIG_IPV6]</literal></screen>
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101 | <!--
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102 | <para>
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103 | If you do not have IPv6 support:
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104 | </para>
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105 |
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106 | <screen><literal>[*] Networking support - - -> [CONFIG_NET]
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107 | Networking Options - - ->
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108 | <*> The IPv6 Protocol - - -> [CONFIG_IPV6]</literal></screen>
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109 |
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110 | <para>
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111 | compiled in, then you must use the <quote>missing_ipv6</quote> patch.
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112 | </para>
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113 | -->
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114 | <indexterm zone="dhcp dhcp-kernel">
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115 | <primary sortas="d-DHCP">DHCP</primary>
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116 | </indexterm>
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117 |
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118 | </sect2>
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119 |
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120 | <sect2 role="installation">
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121 | <title>Installation of ISC DHCP</title>
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122 |
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123 | <!-- Not needed when building DHCP-4.4.3.
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124 | <para>
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125 | First, fix a build issue with GCC 10 and later:
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126 | </para>
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127 |
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128 | <screen><userinput>sed -i '/o.*dhcp_type/d' server/mdb.c &&
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129 | sed -r '/u.*(local|remote)_port/d' \
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130 | -i client/dhclient.c \
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131 | relay/dhcrelay.c</userinput></screen>
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132 | -->
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133 | <note>
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134 | <para>
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135 | This package does not support parallel build.
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136 | </para>
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137 | </note>
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138 | <!-- This should not be needed any more. Visual check appears to handle it.
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139 | <para>
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140 | If you have not compiled IPv6 support into the kernel, apply the
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141 | missing_ipv6 patch:
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142 | </para>
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143 |
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144 | <screen><userinput>patch -Np1 -i ../dhcp-&dhcp-version;-missing_ipv6-1.patch</userinput></screen>
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145 | -->
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146 | <note>
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147 | <para>
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148 | Be careful with the instructions below. The single and
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149 | double quotes are important because the defined
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150 | variables are used verbatim in the code.
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151 | </para>
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152 | </note>
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153 |
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154 | <para>
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155 | Install <application>ISC DHCP</application> by running
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156 | the following commands:
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157 | </para>
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158 |
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159 | <!--
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160 | Running ( export CFLAGS=... ./configure ... ) in a subshell
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161 | preserves CFLAGS if they are set in environment
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162 | -->
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163 | <screen><userinput>( export CFLAGS="${CFLAGS:--g -O2} -Wall -fno-strict-aliasing \
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164 | -D_PATH_DHCLIENT_SCRIPT='\"/usr/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 |
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168 | ./configure --prefix=/usr \
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169 | --sysconfdir=/etc/dhcp \
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170 | --localstatedir=/var \
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171 | --with-srv-lease-file=/var/lib/dhcpd/dhcpd.leases \
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172 | --with-srv6-lease-file=/var/lib/dhcpd/dhcpd6.leases \
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173 | --with-cli-lease-file=/var/lib/dhclient/dhclient.leases \
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174 | --with-cli6-lease-file=/var/lib/dhclient/dhclient6.leases
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175 | ) &&
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176 | make -j1</userinput></screen>
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177 |
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178 | <para>
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179 | <!-- Note: make check builds a library, but otherwise does nothing. -->
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180 | This package does not come with a test suite.
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181 | </para>
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182 |
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183 | <para>
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184 | If you only want to install the <application>ISC DHCP</application> client,
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185 | issue the following commands as the
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186 | <systemitem class="username">root</systemitem> user:
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187 | </para>
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188 |
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189 | <screen role="root"><userinput>make -C client install &&
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190 | install -v -m755 client/scripts/linux /usr/sbin/dhclient-script</userinput></screen>
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191 |
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192 | <para>
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193 | Skip to <xref linkend="dhclient-config"/> in order to configure the
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194 | client
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195 | </para>
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196 |
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197 | <para>
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198 | If you only want to install the <application>ISC DHCP</application> server,
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199 | issue the following command as the
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200 | <systemitem class="username">root</systemitem> user:
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201 | </para>
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202 |
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203 | <screen role="root"><userinput>make -C server install</userinput></screen>
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204 |
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205 | <para>
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206 | Skip to <xref linkend="dhcpd-config"/> in order to configure the server.
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207 | </para>
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208 |
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209 | <para>
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210 | Alternatively, you can install whole package which includes the client,
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211 | server, relay, static libraries and development headers by running the
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212 | following commands as the
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213 | <systemitem class="username">root</systemitem> user:
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214 | </para>
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215 |
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216 | <screen role="root"><userinput>make install &&
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217 | install -v -m755 client/scripts/linux /usr/sbin/dhclient-script</userinput></screen>
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218 |
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219 | </sect2>
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220 |
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221 | <sect2 role="configuration">
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222 | <title>Configuring ISC DHCP</title>
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223 |
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224 | <sect3 id="dhcp-config">
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225 | <title>Config Files</title>
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226 |
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227 | <para>
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228 | <filename>/etc/dhcp/dhclient.conf</filename> and
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229 | <filename>/etc/dhcp/dhcpd.conf</filename>
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230 | </para>
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231 |
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232 | <indexterm zone="dhcp dhcp-config">
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233 | <primary sortas="e-etc-dhcp-dhclient.conf">/etc/dhcp/dhclient.conf</primary>
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234 | </indexterm>
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235 |
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236 | <indexterm zone="dhcp dhcp-config">
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237 | <primary sortas="e-etc-dhcp-dhcpd.conf">/etc/dhcp/dhcpd.conf</primary>
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238 | </indexterm>
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239 |
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240 | </sect3>
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241 |
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242 | <sect3 id="dhclient-config">
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243 | <title>Client Configuration</title>
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244 |
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245 | <para>
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246 | Create a basic <filename>/etc/dhcp/dhclient.conf</filename>
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247 | by running the following command as the
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248 | <systemitem class="username">root</systemitem> user:
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249 | </para>
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250 |
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251 | <screen role="root"><userinput>install -vdm755 /etc/dhcp &&
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252 | cat > /etc/dhcp/dhclient.conf << "EOF"
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253 | <literal># Begin /etc/dhcp/dhclient.conf
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254 | #
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255 | # Basic dhclient.conf(5)
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256 |
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257 | #prepend domain-name-servers 127.0.0.1;
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258 | request subnet-mask, broadcast-address, time-offset, routers,
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259 | domain-name, domain-name-servers, domain-search, host-name,
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260 | netbios-name-servers, netbios-scope, interface-mtu,
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261 | ntp-servers;
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262 | require subnet-mask, domain-name-servers;
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263 | #timeout 60;
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264 | #retry 60;
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265 | #reboot 10;
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266 | #select-timeout 5;
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267 | #initial-interval 2;
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268 |
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269 | # End /etc/dhcp/dhclient.conf</literal>
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270 | EOF</userinput></screen>
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271 |
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272 | <para>
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273 | See <command>man 5 dhclient.conf</command> for additional options.
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274 | </para>
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275 |
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276 | <para>
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277 | Now create the <filename class="directory">/var/lib/dhclient</filename>
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278 | directory which will contain DHCP Client leases by running the following
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279 | command as the <systemitem class="username">root</systemitem> user:
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280 | </para>
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281 |
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282 | <screen role="root"><userinput>install -v -dm 755 /var/lib/dhclient</userinput></screen>
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283 |
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284 | <para id="dhclient-service-sysd" revision="systemd">
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285 | If you want to configure network interfaces at boot using
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286 | <command>dhclient</command>, you need to install the
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287 | <filename>dhclient@.service</filename> unit included in the
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288 | <xref linkend="systemd-units"/> package by running the following
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289 | command as the <systemitem class="username">root</systemitem> user:
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290 | </para>
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291 |
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292 | <indexterm zone="dhcp dhclient-service-sysd" revision="systemd">
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293 | <primary sortas="f-dhclient">dhclient@.service</primary>
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294 | </indexterm>
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295 |
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296 | <screen role="root" revision="systemd"><userinput>make install-dhclient</userinput></screen>
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297 |
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298 | <note revision="systemd">
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299 | <para>
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300 | Make sure that you disable the <command>systemd-networkd</command>
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301 | service or configure it not to manage the interfaces you want to
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302 | manage with <command>dhclient</command>.
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303 | </para>
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304 | </note>
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305 |
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306 | <para>
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307 | At this point you can test if <command>dhclient</command> is
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308 | behaving as expected by running the following command as the
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309 | <systemitem class="username">root</systemitem> user:
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310 | </para>
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311 |
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312 | <screen role="root"
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313 | remap="test"
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314 | revision="sysv"><userinput>dhclient <replaceable><eth0></replaceable></userinput></screen>
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315 |
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316 | <screen role="root"
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317 | remap="test"
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318 | revision="systemd"><userinput>systemctl start dhclient@<replaceable>eth0</replaceable></userinput></screen>
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319 |
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320 | <para revision="sysv">
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321 | Replace <replaceable><eth0></replaceable> with your
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322 | desired interface. If you want more verbose output, add the
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323 | <command>-v</command> parameter to the command above.
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324 | </para>
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325 |
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326 | <para id="dhclient-service" revision="sysv">
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327 | If you want to configure network interfaces at boot using
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328 | <command>dhclient</command>, you need to install the
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329 | <filename>/lib/services/dhclient</filename> script
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330 | included in <xref linkend="bootscripts"/> package:
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331 | </para>
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332 |
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333 | <screen role="root" revision="sysv"><userinput>make install-service-dhclient</userinput></screen>
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334 |
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335 | <indexterm zone="dhcp dhclient-service" revision="sysv">
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336 | <primary sortas="f-dhclient">dhclient (service script)</primary>
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337 | </indexterm>
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338 |
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339 | <para id="dhclient-ifconfig" revision="sysv">
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340 | Next, create the <filename>/etc/sysconfig/ifconfig.eth0</filename>
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341 | configuration file with the following commands as the
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342 | <systemitem class="username">root</systemitem> user:
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343 | </para>
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344 |
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345 | <screen role="root" revision="sysv"><userinput>cat > /etc/sysconfig/ifconfig.eth0 << "EOF"
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346 | <literal>ONBOOT="yes"
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347 | IFACE="eth0"
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348 | SERVICE="dhclient"
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349 | DHCP_START=""
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350 | DHCP_STOP=""
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351 |
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352 | # Set PRINTIP="yes" to have the script print
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353 | # the DHCP assigned IP address
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354 | PRINTIP="no"
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355 |
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356 | # Set PRINTALL="yes" to print the DHCP assigned values for
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357 | # IP, SM, DG, and 1st NS. This requires PRINTIP="yes".
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358 | PRINTALL="no"</literal>
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359 | EOF</userinput></screen>
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360 |
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361 | <indexterm zone="dhcp dhclient-ifconfig" revision="sysv">
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362 | <primary sortas="e-etc-sysconfig-...-dhclient">/etc/sysconfig/ifconfig.eth0</primary>
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363 | </indexterm>
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364 |
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365 | <para revision="sysv">
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366 | Adjust the file to suit your needs.
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367 | </para>
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368 |
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369 | <para revision="sysv">
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370 | For more information on the appropriate <envar>DHCP_START</envar>
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371 | and <envar>DHCP_STOP</envar> values see
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372 | <command>man 8 dhclient</command>.
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373 | </para>
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374 |
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375 | <para revision="systemd">
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376 | To start <command>dhclient</command> on a specific interface
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377 | at boot, enable the previously installed systemd unit by
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378 | 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" revision="systemd"><userinput>systemctl enable dhclient@<replaceable>eth0</replaceable></userinput></screen>
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383 |
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384 | <para revision="systemd">
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385 | Replace <replaceable>eth0</replaceable> with the actual interface name.
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386 | </para>
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387 |
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388 | </sect3>
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389 |
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390 | <sect3 id="dhcpd-config">
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391 | <title>Server Configuration</title>
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392 |
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393 | <para>
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394 | Note that you only need the DHCP server if you want to issue
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395 | LAN addresses over your network. The DHCP client doesn't need
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396 | the server in order to function properly.
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397 | </para>
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398 |
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399 | <para>
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400 | Start with creating <filename>/etc/dhcp/dhcpd.conf</filename>
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401 | by running the following command as the
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402 | <systemitem class="username">root</systemitem> user:
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403 | </para>
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404 |
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405 | <screen role="root"><userinput>cat > /etc/dhcp/dhcpd.conf << "EOF"
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406 | <literal># Begin /etc/dhcp/dhcpd.conf
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407 | #
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408 | # Example dhcpd.conf(5)
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409 |
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410 | # Use this to enable / disable dynamic dns updates globally.
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411 | ddns-update-style none;
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412 |
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413 | # option definitions common to all supported networks...
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414 | option domain-name "example.org";
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415 | option domain-name-servers ns1.example.org, ns2.example.org;
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416 |
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417 | default-lease-time 600;
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418 | max-lease-time 7200;
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419 |
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420 | # This is a very basic subnet declaration.
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421 | subnet 10.254.239.0 netmask 255.255.255.224 {
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422 | range 10.254.239.10 10.254.239.20;
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423 | option routers rtr-239-0-1.example.org, rtr-239-0-2.example.org;
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424 | }
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425 |
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426 | # End /etc/dhcp/dhcpd.conf</literal>
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427 | EOF</userinput></screen>
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428 |
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429 | <para>
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430 | Adjust the file to suit your needs. See
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431 | <command>man 5 dhcpd.conf</command> for additional options.
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432 | </para>
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433 |
|
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434 | <!-- the "touch..." is needed according to dhcpd.leases(5) -->
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435 | <para>
|
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436 | Now create the <filename>/var/lib/dhcpd/dhcpd.leases</filename>
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437 | directory which will contain DHCP Server leases by running the following
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438 | commands as the <systemitem class="username">root</systemitem> user:
|
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439 | </para>
|
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440 |
|
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441 | <screen role="root"><userinput>install -v -dm 755 /var/lib/dhcpd &&
|
---|
442 | touch /var/lib/dhcpd/dhcpd.leases</userinput></screen>
|
---|
443 |
|
---|
444 | <para>
|
---|
445 | If you want to start the DHCP Server at boot, install the
|
---|
446 | <phrase revision="sysv"><filename>/etc/rc.d/init.d/dhcpd</filename>
|
---|
447 | init script</phrase>
|
---|
448 | <phrase revision="systemd"><filename>dhcpd.service</filename>
|
---|
449 | unit</phrase> included in the
|
---|
450 | <xref linkend="bootscripts" revision="sysv"/>
|
---|
451 | <xref linkend="systemd-units" revision="systemd"/>
|
---|
452 | package:
|
---|
453 | </para>
|
---|
454 |
|
---|
455 | <screen role="root"><userinput>make install-dhcpd</userinput></screen>
|
---|
456 |
|
---|
457 | <indexterm zone="dhcp dhcpd-config">
|
---|
458 | <primary sortas="f-dhcpd">dhcpd</primary>
|
---|
459 | </indexterm>
|
---|
460 |
|
---|
461 | <para>
|
---|
462 | You will need to edit the
|
---|
463 | <phrase revision="sysv"><filename>/etc/sysconfig/dhcpd</filename></phrase>
|
---|
464 | <phrase revision="systemd"><filename>/etc/default/dhcpd</filename></phrase>
|
---|
465 | in order to set the interface on which <command>dhcpd</command>
|
---|
466 | will serve the DHCP requests.
|
---|
467 | </para>
|
---|
468 |
|
---|
469 | </sect3>
|
---|
470 |
|
---|
471 | </sect2>
|
---|
472 |
|
---|
473 | <sect2 role="content">
|
---|
474 | <title>Contents</title>
|
---|
475 |
|
---|
476 | <segmentedlist>
|
---|
477 | <segtitle>Installed Programs</segtitle>
|
---|
478 | <segtitle>Installed Libraries</segtitle>
|
---|
479 | <segtitle>Installed Directories</segtitle>
|
---|
480 |
|
---|
481 | <seglistitem>
|
---|
482 | <seg>
|
---|
483 | dhclient, dhclient-script, dhcpd, dhcrelay and omshell
|
---|
484 | </seg>
|
---|
485 | <seg>
|
---|
486 | libdhcpctl.a and libomapi.a
|
---|
487 | </seg>
|
---|
488 | <seg>
|
---|
489 | /etc/dhcp,
|
---|
490 | /usr/include/dhcpctl,
|
---|
491 | /usr/include/isc-dhcp,
|
---|
492 | /usr/include/omapip,
|
---|
493 | /var/lib/dhclient and
|
---|
494 | /var/lib/dhcpd
|
---|
495 | </seg>
|
---|
496 | </seglistitem>
|
---|
497 | </segmentedlist>
|
---|
498 |
|
---|
499 | <variablelist>
|
---|
500 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
|
---|
501 | <?dbfo list-presentation="list"?>
|
---|
502 | <?dbhtml list-presentation="table"?>
|
---|
503 |
|
---|
504 | <varlistentry id="dhclient">
|
---|
505 | <term><command>dhclient</command></term>
|
---|
506 | <listitem>
|
---|
507 | <para>
|
---|
508 | is the implementation of the DHCP client
|
---|
509 | </para>
|
---|
510 | <indexterm zone="dhcp dhclient">
|
---|
511 | <primary sortas="b-dhclient">dhclient</primary>
|
---|
512 | </indexterm>
|
---|
513 | </listitem>
|
---|
514 | </varlistentry>
|
---|
515 |
|
---|
516 | <varlistentry id="dhclient-script">
|
---|
517 | <term><command>dhclient-script</command></term>
|
---|
518 | <listitem>
|
---|
519 | <para>
|
---|
520 | is used by dhclient to (re)configure interfaces. It can make
|
---|
521 | extra changes by invoking custom dhclient-{entry,exit}-hooks
|
---|
522 | </para>
|
---|
523 | <indexterm zone="dhcp dhclient-script">
|
---|
524 | <primary sortas="b-dhclient-script">dhclient-script</primary>
|
---|
525 | </indexterm>
|
---|
526 | </listitem>
|
---|
527 | </varlistentry>
|
---|
528 |
|
---|
529 | <varlistentry id="dhcpd">
|
---|
530 | <term><command>dhcpd</command></term>
|
---|
531 | <listitem>
|
---|
532 | <para>
|
---|
533 | implements Dynamic Host Configuration Protocol (DHCP) and
|
---|
534 | Internet Bootstrap Protocol (BOOTP) requests for network
|
---|
535 | addresses
|
---|
536 | </para>
|
---|
537 | <indexterm zone="dhcp dhcpd">
|
---|
538 | <primary sortas="b-dhcpd">dhcpd</primary>
|
---|
539 | </indexterm>
|
---|
540 | </listitem>
|
---|
541 | </varlistentry>
|
---|
542 |
|
---|
543 | <varlistentry id="dhcrelay">
|
---|
544 | <term><command>dhcrelay</command></term>
|
---|
545 | <listitem>
|
---|
546 | <para>
|
---|
547 | provides a means to accept DHCP and BOOTP requests on a subnet
|
---|
548 | without a DHCP server and relay them to a DHCP server on another
|
---|
549 | subnet
|
---|
550 | </para>
|
---|
551 | <indexterm zone="dhcp dhcrelay">
|
---|
552 | <primary sortas="b-dhcrelay">dhcrelay</primary>
|
---|
553 | </indexterm>
|
---|
554 | </listitem>
|
---|
555 | </varlistentry>
|
---|
556 |
|
---|
557 | <varlistentry id="omshell">
|
---|
558 | <term><command>omshell</command></term>
|
---|
559 | <listitem>
|
---|
560 | <para>
|
---|
561 | provides an interactive way to connect to, query and
|
---|
562 | possibly change the ISC DHCP Server's state via OMAPI, the
|
---|
563 | Object Management API
|
---|
564 | </para>
|
---|
565 | <indexterm zone="dhcp omshell">
|
---|
566 | <primary sortas="b-omshell">omshell</primary>
|
---|
567 | </indexterm>
|
---|
568 | </listitem>
|
---|
569 | </varlistentry>
|
---|
570 |
|
---|
571 | </variablelist>
|
---|
572 |
|
---|
573 | </sect2>
|
---|
574 |
|
---|
575 | </sect1>
|
---|