1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
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3 | "http://www.oasis-open.org/docbook/xml/4.3/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 ntp-download-http "http://www.eecis.udel.edu/~ntp/ntp_spool/ntp4/ntp-&ntp-version;.tar.gz">
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8 | <!ENTITY ntp-download-ftp "ftp://ftp.udel.edu/pub/ntp/ntp4/ntp-&ntp-version;.tar.gz">
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9 | <!ENTITY ntp-size "2.4 MB">
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10 | <!ENTITY ntp-buildsize "27 MB">
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11 | <!ENTITY ntp-time "0.53 SBU">
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12 | ]>
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13 |
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14 | <sect1 id="ntp" xreflabel="NTP-&ntp-version;">
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15 | <sect1info>
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16 | <othername>$LastChangedBy$</othername>
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17 | <date>$Date$</date>
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18 | </sect1info>
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19 | <?dbhtml filename="ntp.html"?>
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20 | <title>NTP-&ntp-version;</title>
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21 |
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22 | <sect2>
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23 | <title>Introduction to <application><acronym>NTP</acronym></application></title>
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24 |
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25 | <para>The <application><acronym>NTP</acronym></application> package contains a client and server
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26 | to keep the time synchronized between various computers over a network.
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27 | This package is the official reference implementation of the <acronym>NTP</acronym> protocol.</para>
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28 |
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29 | <sect3><title>Package information</title>
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30 | <itemizedlist spacing='compact'>
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31 | <listitem><para>Download (HTTP): <ulink url="&ntp-download-http;"/></para></listitem>
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32 | <listitem><para>Download (FTP): <ulink url="&ntp-download-ftp;"/></para></listitem>
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33 | <listitem><para>Download size: &ntp-size;</para></listitem>
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34 | <listitem><para>Estimated Disk space required: &ntp-buildsize;</para></listitem>
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35 | <listitem><para>Estimated build time: &ntp-time;</para></listitem></itemizedlist>
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36 | </sect3>
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37 |
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38 | <sect3><title><application><acronym>NTP</acronym></application> dependencies</title>
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39 | <sect4><title>Optional</title>
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40 | <para><xref linkend="openssl"/></para></sect4>
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41 | </sect3>
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42 |
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43 | </sect2>
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44 |
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45 | <sect2>
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46 | <title>Installation of <application><acronym>NTP</acronym></application></title>
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47 |
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48 | <para>Install <application><acronym>NTP</acronym></application> by running the following
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49 | commands:</para>
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50 |
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51 | <screen><userinput><command>./configure --prefix=/usr --bindir=/usr/sbin \
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52 | --sysconfdir=/etc &&
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53 | make &&
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54 | make install</command></userinput></screen>
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55 |
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56 | </sect2>
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57 |
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58 | <sect2>
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59 | <title>Configuring <application><acronym>NTP</acronym></application></title>
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60 |
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61 | <sect3><title>Config files</title>
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62 | <para><filename>/etc/ntp.conf</filename></para>
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63 | </sect3>
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64 |
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65 | <sect3><title>Configuration Information</title>
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66 |
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67 | <para>The following configuration file defines various <acronym>NTP</acronym>
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68 | stratum 2 servers with open access from different continents. It also
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69 | creates a drift file where <command>ntpd</command> stores the frequency
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70 | offset. Since the documentation included with the package is sparse,
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71 | visit the <acronym>NTP</acronym> website at
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72 | <ulink url="http://www.ntp.org/"/> for more information.</para>
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73 |
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74 | <screen><userinput><command>cat > /etc/ntp.conf << "EOF"</command>
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75 | # Africa
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76 | server tock.nml.csir.co.za
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77 |
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78 | # Asia
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79 | server ntp.shim.org
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80 |
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81 | # Australia
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82 | server ntp.saard.net
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83 |
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84 | # Europe
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85 | server ntp.tuxfamily.net
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86 |
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87 | # North America
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88 | server clock.psu.edu
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89 |
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90 | driftfile /var/cache/ntp.drift
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91 | <command>EOF</command></userinput></screen>
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92 | </sect3>
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93 |
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94 | <sect3><title>Synchronizing the time</title>
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95 |
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96 | <para>There are two options. Option one is to run <command>ntpd</command>
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97 | continuously and allow it to synchronize the time in a gradual manner. The other
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98 | option is to run <command>ntpd</command> periodically (using cron)
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99 | and update the time each time <command>ntpd</command> is scheduled.</para>
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100 |
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101 | <para>If you choose Option one, then install the
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102 | <filename>/etc/rc.d/init.d/ntp</filename>
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103 | init script included in the
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104 | <xref linkend="intro-important-bootscripts"/> package.</para>
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105 |
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106 | <screen><userinput><command>make install-ntp</command></userinput></screen>
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107 |
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108 | <para>If you prefer to run ntpd periodically, add the following command to
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109 | root's <filename>crontab</filename>:</para>
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110 | <screen><userinput>ntpd -q</userinput></screen>
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111 |
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112 | <para>Execute the following command if you would like to set the
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113 | hardware clock at shutdown and reboot based on the current system
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114 | time:</para>
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115 |
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116 | <screen><userinput><command>ln -sf ../init.d/setclock /etc/rc.d/rc0.d/K46setclock &&
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117 | ln -sf ../init.d/setclock /etc/rc.d/rc6.d/K46setclock</command></userinput></screen>
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118 |
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119 | <para>The other way around is already set up by
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120 | <acronym>LFS</acronym>.</para>
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121 |
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122 | </sect3>
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123 |
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124 | </sect2>
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125 |
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126 | <sect2>
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127 | <title>Contents</title>
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128 |
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129 | <para>The <application><acronym>NTP</acronym></application> package
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130 | contains <command>ntp-wait</command>, <command>ntptrace</command>,
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131 | <command>ntpd</command>, <command>ntpdate</command>,
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132 | <command>ntpdc</command>, <command>ntpq</command>,
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133 | <command>ntptime</command>, <command>tickadj</command> and
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134 | <command>ntp-keygen</command>.</para>
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135 |
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136 | </sect2>
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137 |
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138 | <sect2><title>Description</title>
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139 |
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140 | <sect3><title>ntp-wait</title>
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141 | <para><command>ntp-wait</command> is useful at boot time, to delay the
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142 | boot sequence until <command>ntpd</command> has set the
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143 | time.</para></sect3>
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144 |
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145 | <sect3><title>ntptrace</title>
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146 | <para><command>ntptrace</command> traces a chain of
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147 | <acronym>NTP</acronym> servers back to the primary source.</para></sect3>
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148 |
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149 | <sect3><title>ntpd</title>
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150 | <para><command>ntpd</command> is a NTP daemon that runs in the
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151 | background and keeps the date and time synchronized based on response
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152 | from configured <acronym>NTP</acronym> servers. It also functions as a
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153 | <acronym>NTP</acronym> server.</para></sect3>
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154 |
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155 | <sect3><title>ntpdate</title>
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156 | <para><command>ntpdate</command> is a client program that sets the date
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157 | and time based on the response from an <acronym>NTP</acronym> server.
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158 | This command is deprecated.</para></sect3>
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159 |
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160 | <sect3><title>ntpdc</title>
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161 | <para><command>ntpdc</command> is used to query the
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162 | <acronym>NTP</acronym> daemon about its current state and to request
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163 | changes in that state.</para></sect3>
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164 |
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165 | <sect3><title>ntpq</title>
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166 | <para><command>ntpq</command> is an utility program used to monitor
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167 | <command>ntpd</command> operations and determine
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168 | performance.</para></sect3>
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169 |
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170 | <sect3><title>ntptime</title>
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171 | <para><command>ntptime</command> reads and displays time-related
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172 | kernel variables.</para></sect3>
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173 |
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174 | <sect3><title>tickadj</title>
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175 | <para><command>tickadj</command> reads, and optionally modifies,
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176 | several timekeeping-related variables in older kernels that do not have
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177 | support for precision timekeeping.</para></sect3>
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178 |
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179 | <sect3><title>ntp-keygen</title>
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180 | <para><command>ntp-keygen</command> generates cryptographic data files
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181 | used by the <acronym>NTP</acronym>v4 authentication and identification
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182 | schemes.</para></sect3>
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183 |
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184 | </sect2>
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185 |
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186 | </sect1>
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