1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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3 | "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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4 | <!ENTITY % general-entities SYSTEM "../../general.ent">
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5 | %general-entities;
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6 |
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7 | <!ENTITY dhcp-download-http " ">
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8 | <!ENTITY dhcp-download-ftp "ftp://ftp.isc.org/isc/dhcp/&dhcp-version;/dhcp-&dhcp-version;.tar.gz">
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9 | <!ENTITY dhcp-md5sum "5a284875dd2c12ddd388416d69156a67">
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10 | <!ENTITY dhcp-size "8.8 MB">
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11 | <!ENTITY dhcp-buildsize "110 MB">
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12 | <!ENTITY dhcp-time "0.5 SBU">
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13 | ]>
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14 |
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15 | <sect1 id="dhcp" xreflabel="DHCP-&dhcp-version;">
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16 | <?dbhtml filename="dhcp.html"?>
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17 |
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18 | <sect1info>
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19 | <othername>$LastChangedBy$</othername>
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20 | <date>$Date$</date>
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21 | </sect1info>
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22 |
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23 | <title>DHCP-&dhcp-version;</title>
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24 |
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25 | <indexterm zone="dhcp">
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26 | <primary sortas="a-DHCP">DHCP</primary>
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27 | </indexterm>
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28 |
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29 | <sect2 role="package">
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30 | <title>Introduction to ISC DHCP</title>
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31 |
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32 | <para>
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33 | The <application>ISC DHCP</application> package contains both the client and
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34 | server programs for DHCP. <command>dhclient</command> (the client) is
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35 | used for connecting to a network which uses DHCP to assign network
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36 | addresses. <command>dhcpd</command> (the server) is used for assigning
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37 | network addresses on private networks.
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38 | </para>
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39 |
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40 | &lfs77_checked;
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41 |
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42 | <bridgehead renderas="sect3">Package Information</bridgehead>
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43 | <itemizedlist spacing="compact">
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44 | <listitem>
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45 | <para>
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46 | Download (HTTP): <ulink url="&dhcp-download-http;"/>
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47 | </para>
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48 | </listitem>
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49 | <listitem>
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50 | <para>
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51 | Download (FTP): <ulink url="&dhcp-download-ftp;"/>
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52 | </para>
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53 | </listitem>
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54 | <listitem>
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55 | <para>
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56 | Download MD5 sum: &dhcp-md5sum;
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57 | </para>
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58 | </listitem>
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59 | <listitem>
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60 | <para>
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61 | Download size: &dhcp-size;
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62 | </para>
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63 | </listitem>
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64 | <listitem>
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65 | <para>
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66 | Estimated disk space required: &dhcp-buildsize;
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67 | </para>
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68 | </listitem>
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69 | <listitem>
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70 | <para>
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71 | Estimated build time: &dhcp-time;
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72 | </para>
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73 | </listitem>
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74 | </itemizedlist>
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75 |
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76 | <bridgehead renderas="sect3">Additional Downloads</bridgehead>
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77 | <itemizedlist spacing="compact">
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78 | <listitem>
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79 | <para>
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80 | Required patch:
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81 | <ulink url="&patch-root;/dhcp-&dhcp-version;-client_script-1.patch"/>
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82 | </para>
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83 | </listitem>
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84 | <listitem>
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85 | <para>
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86 | Optional patch:
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87 | <ulink url="&patch-root;/dhcp-&dhcp-version;-missing_ipv6-1.patch"/>
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88 | </para>
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89 | </listitem>
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90 | </itemizedlist>
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91 |
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92 | <para condition="html" role="usernotes">User Notes:
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93 | <ulink url="&blfs-wiki;/dhcp"/>
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94 | </para>
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95 | </sect2>
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96 |
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97 | <sect2 role="kernel" id="dhcp-kernel">
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98 | <title>Kernel Configuration</title>
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99 |
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100 | <para>
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101 | You must have Packet Socket support:
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102 | </para>
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103 |
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104 | <screen><literal>[*] Networking support ---> [CONFIG_NET]
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105 | Networking options --->
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106 | <*> Packet socket [CONFIG_PACKET]</literal></screen>
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107 |
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108 | <para>
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109 | If you do not have IPv6 support:
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110 | </para>
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111 |
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112 | <screen><literal>[*] Networking support ---> [CONFIG_NET]
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113 | Networking Options --->
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114 | <*> The IPv6 Protocol ---> [CONFIG_IPV6]</literal></screen>
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115 |
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116 | <para>
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117 | compiled in, then you must use the <quote>missing_ipv6</quote> patch.
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118 | </para>
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119 |
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120 | <indexterm zone="dhcp dhcp-kernel">
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121 | <primary sortas="d-DHCP">DHCP</primary>
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122 | </indexterm>
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123 |
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124 | </sect2>
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125 |
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126 | <sect2 role="installation">
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127 | <title>Installation of ISC DHCP</title>
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128 |
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129 | <para>
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130 | If you have not compiled IPv6 support into the kernel, apply the
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131 | missing_ipv6 patch:
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132 | </para>
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133 |
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134 | <screen><userinput>patch -Np1 -i ../dhcp-&dhcp-version;-missing_ipv6-1.patch</userinput></screen>
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135 |
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136 | <note>
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137 | <para>
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138 | Be careful with the instructions below. The single and
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139 | double quotes are important because the defined
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140 | variables are used verbatim in the code.
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141 | </para>
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142 | </note>
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143 |
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144 | <para>
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145 | Install <application>ISC DHCP</application> by running
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146 | the following commands:
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147 | </para>
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148 |
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149 | <screen><userinput>patch -Np1 -i ../dhcp-&dhcp-version;-client_script-1.patch &&
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150 | CFLAGS="-D_PATH_DHCLIENT_SCRIPT='\"/sbin/dhclient-script\"' \
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151 | -D_PATH_DHCPD_CONF='\"/etc/dhcp/dhcpd.conf\"' \
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152 | -D_PATH_DHCLIENT_CONF='\"/etc/dhcp/dhclient.conf\"'" \
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153 | ./configure --prefix=/usr \
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154 | --sysconfdir=/etc/dhcp \
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155 | --localstatedir=/var \
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156 | --with-srv-lease-file=/var/lib/dhcpd/dhcpd.leases \
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157 | --with-srv6-lease-file=/var/lib/dhcpd/dhcpd6.leases \
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158 | --with-cli-lease-file=/var/lib/dhclient/dhclient.leases \
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159 | --with-cli6-lease-file=/var/lib/dhclient/dhclient6.leases &&
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160 | make</userinput></screen>
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161 |
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162 | <para>
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163 | To test the results, issue: <command>make check</command>
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164 | </para>
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165 |
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166 | <para>
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167 | If you only want to install the <application>ISC DHCP</application> client,
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168 | issue the following commands as the
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169 | <systemitem class="username">root</systemitem> user:
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170 | </para>
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171 |
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172 | <screen role="root"><userinput>make -C client install &&
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173 | mv -v /usr/sbin/dhclient /sbin &&
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174 | install -v -m755 client/scripts/linux /sbin/dhclient-script</userinput></screen>
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175 |
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176 | <para>
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177 | Skip to <xref linkend="dhclient-config"/> in order to configure the client
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178 | </para>
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179 |
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180 | <para>
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181 | If you only want to install the <application>ISC DHCP</application> server,
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182 | issue the following command as the
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183 | <systemitem class="username">root</systemitem> user:
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184 | </para>
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185 |
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186 | <screen role="root"><userinput>make -C server install</userinput></screen>
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187 |
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188 | <para>
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189 | Skip to <xref linkend="dhcpd-config"/> in order to configure the server.
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190 | </para>
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191 |
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192 | <para>
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193 | Alternatively, you can install whole package which includes the client,
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194 | server, relay, static libraries and development headers by running the
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195 | following commands as the
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196 | <systemitem class="username">root</systemitem> user:
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197 | </para>
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198 |
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199 | <screen role="root"><userinput>make install &&
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200 | mv -v /usr/sbin/dhclient /sbin &&
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201 | install -v -m755 client/scripts/linux /sbin/dhclient-script</userinput></screen>
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202 |
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203 | </sect2>
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204 |
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205 | <sect2 role="configuration">
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206 | <title>Configuring ISC DHCP</title>
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207 |
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208 | <sect3 id="dhcp-config">
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209 | <title>Config Files</title>
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210 |
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211 | <para>
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212 | <filename>/etc/dhcp/dhclient.conf</filename> and
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213 | <filename>/etc/dhcp/dhcpd.conf</filename>
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214 | </para>
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215 |
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216 | <indexterm zone="dhcp dhcp-config">
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217 | <primary sortas="e-etc-dhcp-dhclient.conf">/etc/dhcp/dhclient.conf</primary>
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218 | </indexterm>
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219 |
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220 | <indexterm zone="dhcp dhcp-config">
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221 | <primary sortas="e-etc-dhcp-dhcpd.conf">/etc/dhcp/dhcpd.conf</primary>
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222 | </indexterm>
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223 |
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224 | </sect3>
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225 |
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226 | <sect3 id="dhclient-config">
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227 | <title>Client Configuration</title>
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228 |
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229 | <para>
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230 | Create basic <filename>/etc/dhcp/dhclient.conf</filename>
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231 | by running the following command as the
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232 | <systemitem class="username">root</systemitem> user:
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233 | </para>
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234 |
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235 | <screen role="root"><userinput>cat > /etc/dhcp/dhclient.conf << "EOF"
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236 | <literal># Begin /etc/dhcp/dhclient.conf
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237 | #
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238 | # Basic dhclient.conf(5)
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239 |
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240 | #prepend domain-name-servers 127.0.0.1;
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241 | request subnet-mask, broadcast-address, time-offset, routers,
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242 | domain-name, domain-name-servers, domain-search, host-name,
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243 | netbios-name-servers, netbios-scope, interface-mtu,
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244 | ntp-servers;
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245 | require subnet-mask, domain-name-servers;
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246 | #timeout 60;
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247 | #retry 60;
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248 | #reboot 10;
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249 | #select-timeout 5;
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250 | #initial-interval 2;
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251 |
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252 | # End /etc/dhcp/dhclient.conf</literal>
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253 | EOF</userinput></screen>
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254 |
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255 | <para>
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256 | See <command>man 5 dhclient.conf</command> for additional options.
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257 | </para>
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258 |
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259 | <para>
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260 | Now create the <filename class="directory">/var/lib/dhclient</filename>
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261 | directory which will contain DHCP Client leases by running the following
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262 | command as the <systemitem class="username">root</systemitem> user:
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263 | </para>
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264 |
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265 | <screen role="root"><userinput>install -v -dm 755 /var/lib/dhclient</userinput></screen>
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266 |
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267 | <para>
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268 | At this point you can test if <command>dhclient</command> is
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269 | behaving as expected by running the following command as the
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270 | <systemitem class="username">root</systemitem> user:
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271 | </para>
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272 |
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273 | <screen role="root"><userinput>dhclient <replaceable><eth0></replaceable></userinput></screen>
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274 |
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275 | <para>
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276 | Replace <replaceable><eth0></replaceable> with your
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277 | desired interface. If you want more verbose output, add the
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278 | <command>-v</command> parameter to the command above.
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279 | </para>
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280 |
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281 | <para id="dhclient-service">
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282 | If you want to configure network interfaces at boot using
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283 | <command>dhclient</command>, you need to install the
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284 | <filename>/lib/services/dhclient</filename> script
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285 | included in <xref linkend="bootscripts"/> package:
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286 | </para>
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287 |
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288 | <screen role="root"><userinput>make install-service-dhclient</userinput></screen>
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289 |
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290 | <indexterm zone="dhcp dhclient-service">
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291 | <primary sortas="f-dhclient">dhclient (service script)</primary>
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292 | </indexterm>
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293 |
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294 | <para id="dhclient-ifconfig">
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295 | Next, create the <filename>/etc/sysconfig/ifconfig.eth0</filename>
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296 | configuration file with the following commands as the
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297 | <systemitem class="username">root</systemitem> user:
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298 | </para>
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299 |
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300 | <screen role="root"><userinput>cat > /etc/sysconfig/ifconfig.eth0 << "EOF"
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301 | <literal>ONBOOT="yes"
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302 | IFACE="eth0"
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303 | SERVICE="dhclient"
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304 | DHCP_START=""
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305 | DHCP_STOP=""
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306 |
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307 | # Set PRINTIP="yes" to have the script print
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308 | # the DHCP assigned IP address
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309 | PRINTIP="no"
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310 |
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311 | # Set PRINTALL="yes" to print the DHCP assigned values for
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312 | # IP, SM, DG, and 1st NS. This requires PRINTIP="yes".
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313 | PRINTALL="no"</literal>
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314 | EOF</userinput></screen>
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315 |
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316 | <indexterm zone="dhcp dhclient-ifconfig">
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317 | <primary sortas="e-etc-sysconfig-...-dhclient">/etc/sysconfig/ifconfig.eth0</primary>
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318 | </indexterm>
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319 |
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320 | <para>
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321 | Adjust the file to suit your needs.
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322 | </para>
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323 |
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324 | <para>
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325 | For more information on the appropriate <envar>DHCP_START</envar>
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326 | and <envar>DHCP_STOP</envar> values see
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327 | <command>man 8 dhclient</command>.
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328 | </para>
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329 |
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330 | </sect3>
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331 |
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332 | <sect3 id="dhcpd-config">
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333 | <title>Server Configuration</title>
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334 |
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335 | <para>
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336 | Note that you only need the DHCP server if you want to issue
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337 | LAN addresses over your network. The DHCP client doesn't need
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338 | the server in order to function properly.
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339 | </para>
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340 |
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341 | <para>
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342 | Start with creating <filename>/etc/dhcp/dhcpd.conf</filename>
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343 | by running the following command as the
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344 | <systemitem class="username">root</systemitem> user:
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345 | </para>
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346 |
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347 | <screen role="root"><userinput>cat > /etc/dhcp/dhcpd.conf << "EOF"
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348 | <literal># Begin /etc/dhcp/dhcpd.conf
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349 | #
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350 | # Example dhcpd.conf(5)
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351 |
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352 | # Use this to enble / disable dynamic dns updates globally.
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353 | ddns-update-style none;
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354 |
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355 | # option definitions common to all supported networks...
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356 | option domain-name "example.org";
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357 | option domain-name-servers ns1.example.org, ns2.example.org;
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358 |
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359 | default-lease-time 600;
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360 | max-lease-time 7200;
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361 |
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362 | # This is a very basic subnet declaration.
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363 | subnet 10.254.239.0 netmask 255.255.255.224 {
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364 | range 10.254.239.10 10.254.239.20;
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365 | option routers rtr-239-0-1.example.org, rtr-239-0-2.example.org;
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366 | }
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367 |
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368 | # End /etc/dhcp/dhcpd.conf</literal>
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369 | EOF</userinput></screen>
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370 |
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371 | <para>
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372 | Adjust the file to suit your needs. See
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373 | <command>man 5 dhcpd.conf</command> for additional options.
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374 | </para>
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375 |
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376 | <para>
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377 | Now create the <filename class="directory">/var/lib/dhcpd</filename>
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378 | directory which will contain DHCP Server leases by running the following
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379 | command as the <systemitem class="username">root</systemitem> user:
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380 | </para>
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381 |
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382 | <screen role="root"><userinput>install -v -dm 755 /var/lib/dhcpd</userinput></screen>
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383 |
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384 | <para>
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385 | If you want to start the DHCP Server at boot, install
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386 | the <filename>/etc/rc.d/init.d/dhcpd</filename>
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387 | init script included in the <xref linkend="bootscripts"/>
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388 | package:
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389 | </para>
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390 |
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391 | <screen role="root"><userinput>make install-dhcpd</userinput></screen>
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392 |
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393 | <indexterm zone="dhcp dhcpd-config">
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394 | <primary sortas="f-dhcpd">dhcpd</primary>
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395 | </indexterm>
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396 |
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397 | <para>
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398 | You will need to edit the
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399 | <filename>/etc/sysconfig/dhcpd</filename> in order
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400 | to set the interface on which <command>dhcpd</command>
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401 | will serve the DHCP requests.
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402 | </para>
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403 |
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404 | </sect3>
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405 |
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406 | </sect2>
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407 |
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408 | <sect2 role="content">
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409 | <title>Contents</title>
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410 |
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411 | <segmentedlist>
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412 | <segtitle>Installed Programs</segtitle>
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413 | <segtitle>Installed Libraries</segtitle>
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414 | <segtitle>Installed Directories</segtitle>
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415 |
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416 | <seglistitem>
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417 | <seg>
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418 | dhclient, dhclient-script, dhcpd, dhcrelay and omshell
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419 | </seg>
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420 | <seg>
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421 | libdhcpctl.a, libdst.a and libomapi.a
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422 | </seg>
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423 | <seg>
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424 | /etc/dhcp,
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425 | /usr/include/dhcpctl,
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426 | /usr/include/isc-dhcp,
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427 | /usr/include/omapip,
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428 | /var/lib/dhclient and
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429 | /var/lib/dhcpd
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430 | </seg>
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431 | </seglistitem>
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432 | </segmentedlist>
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433 |
|
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434 | <variablelist>
|
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435 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
|
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436 | <?dbfo list-presentation="list"?>
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437 | <?dbhtml list-presentation="table"?>
|
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438 |
|
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439 | <varlistentry id="dhclient">
|
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440 | <term><command>dhclient</command></term>
|
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441 | <listitem>
|
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442 | <para>
|
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443 | is the implementation of the DHCP client.
|
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444 | </para>
|
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445 | <indexterm zone="dhcp dhclient">
|
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446 | <primary sortas="b-dhclient">dhclient</primary>
|
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447 | </indexterm>
|
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448 | </listitem>
|
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449 | </varlistentry>
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450 |
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451 | <varlistentry id="dhclient-script">
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452 | <term><command>dhclient-script</command></term>
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453 | <listitem>
|
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454 | <para>
|
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455 | is used by dhclient to (re)configure interfaces. It can make
|
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456 | extra changes by invoking custom dhclient-{entry,exit}-hooks.
|
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457 | </para>
|
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458 | <indexterm zone="dhcp dhclient-script">
|
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459 | <primary sortas="b-dhclient-script">dhclient-script</primary>
|
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460 | </indexterm>
|
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461 | </listitem>
|
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462 | </varlistentry>
|
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463 |
|
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464 | <varlistentry id="dhcpd">
|
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465 | <term><command>dhcpd</command></term>
|
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466 | <listitem>
|
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467 | <para>
|
---|
468 | implements Dynamic Host Configuration Protocol (DHCP) and
|
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469 | Internet Bootstrap Protocol (BOOTP) requests for network
|
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470 | addresses.
|
---|
471 | </para>
|
---|
472 | <indexterm zone="dhcp dhcpd">
|
---|
473 | <primary sortas="b-dhcpd">dhcpd</primary>
|
---|
474 | </indexterm>
|
---|
475 | </listitem>
|
---|
476 | </varlistentry>
|
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477 |
|
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478 | <varlistentry id="dhcrelay">
|
---|
479 | <term><command>dhcrelay</command></term>
|
---|
480 | <listitem>
|
---|
481 | <para>
|
---|
482 | provides a means to accept DHCP and BOOTP requests on a subnet
|
---|
483 | without a DHCP server and relay them to a DHCP server on another
|
---|
484 | subnet.
|
---|
485 | </para>
|
---|
486 | <indexterm zone="dhcp dhcrelay">
|
---|
487 | <primary sortas="b-dhcrelay">dhcrelay</primary>
|
---|
488 | </indexterm>
|
---|
489 | </listitem>
|
---|
490 | </varlistentry>
|
---|
491 |
|
---|
492 | <varlistentry id="omshell">
|
---|
493 | <term><command>omshell</command></term>
|
---|
494 | <listitem>
|
---|
495 | <para>
|
---|
496 | provides an interactive way to connect to, query and
|
---|
497 | possibly change the ISC DHCP Server's state via OMAPI, the
|
---|
498 | Object Management API.
|
---|
499 | </para>
|
---|
500 | <indexterm zone="dhcp omshell">
|
---|
501 | <primary sortas="b-omshell">omshell</primary>
|
---|
502 | </indexterm>
|
---|
503 | </listitem>
|
---|
504 | </varlistentry>
|
---|
505 |
|
---|
506 | </variablelist>
|
---|
507 |
|
---|
508 | </sect2>
|
---|
509 |
|
---|
510 | </sect1>
|
---|