[246c904] | 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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[6732c094] | 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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| 3 | "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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[246c904] | 4 | <!ENTITY % general-entities SYSTEM "../../general.ent">
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| 5 | %general-entities;
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[14d6b3e0] | 6 |
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[33e82b1] | 7 | <!ENTITY dhcpcd-download-http "https://roy.marples.name/downloads/dhcpcd/dhcpcd-&dhcpcd-version;.tar.xz">
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[1daf46d1] | 8 | <!ENTITY dhcpcd-download-ftp "ftp://roy.marples.name/pub/dhcpcd/dhcpcd-&dhcpcd-version;.tar.xz">
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[b905a81] | 9 | <!ENTITY dhcpcd-md5sum "dd77711cf3232002bb075f5210269f88">
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[a82b4c61] | 10 | <!ENTITY dhcpcd-size "244 KB">
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| 11 | <!ENTITY dhcpcd-buildsize "3.5 MB (with tests)">
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[e0a7d67c] | 12 | <!ENTITY dhcpcd-time "less than 0.1 SBU (with tests)">
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[246c904] | 13 | ]>
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[af652fc] | 14 | <!--
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| 15 | Use this URL as ChangeLog:
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| 16 | https://roy.marples.name/blog/dhcpcd-9-1-0-released.html
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| 17 | Substitute the 9-1-0 with 9-1-1 or 9-1-2 ...
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| 18 | -->
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[246c904] | 19 |
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[fd680fb] | 20 | <sect1 id="dhcpcd" xreflabel="dhcpcd-&dhcpcd-version;">
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[820d164a] | 21 | <?dbhtml filename="dhcpcd.html"?>
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[4839c17] | 22 |
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[820d164a] | 23 | <sect1info>
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| 24 | <othername>$LastChangedBy$</othername>
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| 25 | <date>$Date$</date>
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| 26 | </sect1info>
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[4839c17] | 27 |
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[add19ff9] | 28 | <title>dhcpcd-&dhcpcd-version;</title>
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[4839c17] | 29 |
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[820d164a] | 30 | <indexterm zone="dhcpcd">
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[add19ff9] | 31 | <primary sortas="a-dhcpcd">dhcpcd</primary>
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[820d164a] | 32 | </indexterm>
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| 33 |
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| 34 | <sect2 role="package">
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[add19ff9] | 35 | <title>Introduction to dhcpcd</title>
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[820d164a] | 36 |
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[7c56ece] | 37 | <para>
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| 38 | <application>dhcpcd</application> is an implementation of the
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| 39 | DHCP client specified in RFC2131. A DHCP client is useful for connecting
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| 40 | your computer to a network which uses DHCP to assign network
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| 41 | addresses. dhcpcd strives to be a fully featured, yet very lightweight
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| 42 | DHCP client.
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| 43 | </para>
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[4839c17] | 44 |
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[f243c97] | 45 | &lfs10_checked;
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[77ac0f23] | 46 |
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[820d164a] | 47 | <bridgehead renderas="sect3">Package Information</bridgehead>
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| 48 | <itemizedlist spacing="compact">
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| 49 | <listitem>
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[7c56ece] | 50 | <para>
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| 51 | Download (HTTP): <ulink url="&dhcpcd-download-http;"/>
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| 52 | </para>
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[820d164a] | 53 | </listitem>
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| 54 | <listitem>
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[7c56ece] | 55 | <para>
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| 56 | Download (FTP): <ulink url="&dhcpcd-download-ftp;"/>
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| 57 | </para>
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[820d164a] | 58 | </listitem>
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| 59 | <listitem>
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[7c56ece] | 60 | <para>
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| 61 | Download MD5 sum: &dhcpcd-md5sum;
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| 62 | </para>
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[820d164a] | 63 | </listitem>
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| 64 | <listitem>
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[7c56ece] | 65 | <para>
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| 66 | Download size: &dhcpcd-size;
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| 67 | </para>
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[820d164a] | 68 | </listitem>
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| 69 | <listitem>
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[7c56ece] | 70 | <para>
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| 71 | Estimated disk space required: &dhcpcd-buildsize;
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| 72 | </para>
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[820d164a] | 73 | </listitem>
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| 74 | <listitem>
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[7c56ece] | 75 | <para>
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| 76 | Estimated build time: &dhcpcd-time;
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| 77 | </para>
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[820d164a] | 78 | </listitem>
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| 79 | </itemizedlist>
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[4839c17] | 80 |
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[4edf8452] | 81 | <bridgehead renderas="sect3">dhcpcd Dependencies</bridgehead>
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| 82 |
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| 83 | <bridgehead renderas="sect4">Optional</bridgehead>
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| 84 | <para role="optional">
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[7c56ece] | 85 | <xref linkend="llvm"/> (with Clang),
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| 86 | <xref linkend="ntp"/>,
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| 87 | <ulink url="https://chrony.tuxfamily.org/">chronyd</ulink>, and
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| 88 | <ulink url="https://github.com/thkukuk/ypbind-mt/">ypbind</ulink>
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[4edf8452] | 89 | </para>
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| 90 |
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[7e1f3aa] | 91 | <para condition="html" role="usernotes">User Notes:
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| 92 | <ulink url="&blfs-wiki;/dhcpcd"/></para>
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| 93 |
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[820d164a] | 94 | </sect2>
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[4839c17] | 95 |
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[820d164a] | 96 | <sect2 role="installation">
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[add19ff9] | 97 | <title>Installation of dhcpcd</title>
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[820d164a] | 98 |
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[05c8448] | 99 | <para>
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[f8359b8] | 100 | Recent releases of <application>dhcpcd</application> implement privilege
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| 101 | separation. Additional installation steps are necessary to set up
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[05c8448] | 102 | the proper environment, which are performed by issuing the following
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| 103 | commands as the <systemitem class="username">root</systemitem> user:
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| 104 | </para>
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| 105 |
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| 106 | <screen role="root"><userinput>install -v -m700 -d /var/lib/dhcpcd &&
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| 107 |
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| 108 | groupadd -g 52 dhcpcd &&
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| 109 | useradd -c 'dhcpcd PrivSep' \
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| 110 | -d /var/lib/dhcpcd \
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| 111 | -g dhcpcd \
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| 112 | -s /bin/false \
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| 113 | -u 52 dhcpcd &&
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| 114 | chown -v dhcpcd:dhcpcd /var/lib/dhcpcd </userinput></screen>
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| 115 |
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[7c56ece] | 116 | <para>
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| 117 | Install <application>dhcpcd</application> by running the following
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| 118 | commands:
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| 119 | </para>
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[820d164a] | 120 |
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[f0740ab] | 121 | <screen><userinput>./configure --libexecdir=/lib/dhcpcd \
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[1af66bb9] | 122 | --dbdir=/var/lib/dhcpcd \
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| 123 | --privsepuser=dhcpcd &&
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[f0740ab] | 124 | make</userinput></screen>
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[f9a784a] | 125 |
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[7c56ece] | 126 | <para>
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| 127 | To test the results, issue: <command>make test</command>.
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| 128 | </para>
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[f9a784a] | 129 |
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[7c56ece] | 130 | <para>
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| 131 | Now, as the <systemitem class="username">root</systemitem> user:
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| 132 | </para>
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[f9a784a] | 133 |
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[bfa01156] | 134 | <screen role='root'><userinput>make install</userinput></screen>
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[4839c17] | 135 |
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[690658a5] | 136 | <!--
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[7c56ece] | 137 | <para>
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| 138 | By default, a plain text lease info file isn't created but the
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| 139 | <application>dhcpcd</application> provides a hook which can be used for
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| 140 | creating such a file. Install the hook by running the following commands
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| 141 | as the <systemitem class="username">root</systemitem> user:
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| 142 | </para>
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[232e46a] | 143 |
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[bfa01156] | 144 | <screen role='root'><userinput>sed -i "s;/var/lib;/run;g" dhcpcd-hooks/50-dhcpcd-compat &&
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[f9a784a] | 145 | install -v -m 644 dhcpcd-hooks/50-dhcpcd-compat /lib/dhcpcd/dhcpcd-hooks/</userinput></screen>
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[690658a5] | 146 | -->
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[4839c17] | 147 |
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[820d164a] | 148 | </sect2>
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[4839c17] | 149 |
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[690658a5] | 150 | <sect2 role="commands">
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| 151 | <title>Command Explanations</title>
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| 152 |
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| 153 | <para>
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| 154 | <parameter>--libexecdir=/lib/dhcpcd</parameter>: The default
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| 155 | <filename class="directory">/libexec</filename> is not FHS-compliant.
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| 156 | Since this directory may need to be available early in the boot,
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| 157 | <filename class="directory">/usr/libexec</filename> cannot be used either.
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| 158 | </para>
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| 159 |
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| 160 | <para>
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[a3ec5c1] | 161 | <parameter>--dbdir=/var/lib/dhcpcd</parameter>: The default
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| 162 | <filename class="directory">/var/db</filename> is not FHS-compliant
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[690658a5] | 163 | </para>
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| 164 |
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| 165 | <para>
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| 166 | <option>--with-hook=...</option>: You can optionally install more hooks,
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| 167 | for example to install some configuration files such as
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| 168 | <filename>ntp.conf</filename>. The set of hooks is in the
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| 169 | <filename class="directory">dhcpcd-hooks</filename> directory in the
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| 170 | build tree.
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| 171 | </para>
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| 172 | </sect2>
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| 173 |
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[820d164a] | 174 | <sect2 role="configuration">
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[add19ff9] | 175 | <title>Configuring dhcpcd</title>
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[820d164a] | 176 |
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| 177 | <sect3 id="dhcpcd-config">
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| 178 | <title>Config Files</title>
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[4839c17] | 179 |
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[7c56ece] | 180 | <para>
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| 181 | <filename>/etc/dhcpcd.conf</filename>
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| 182 | </para>
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[4839c17] | 183 |
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[820d164a] | 184 | <indexterm zone="dhcpcd dhcpcd-config">
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[fefa337] | 185 | <primary sortas="e-etc-dhcpcd-dhcpcd-conf">/etc/dhcpcd/dhcpcd.conf</primary>
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[820d164a] | 186 | </indexterm>
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[4839c17] | 187 |
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[820d164a] | 188 | </sect3>
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| 189 |
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[3c7bd00] | 190 | <sect3 id="dhcpcd-init" revision="sysv">
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[e5f38d6b] | 191 | <title>General Configuration Information</title>
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[820d164a] | 192 |
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[7c56ece] | 193 | <para>
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| 194 | To configure <command>dhcpcd</command>, you need to first install
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| 195 | the network service script,
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| 196 | <filename>/lib/services/dhcpcd</filename>
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| 197 | included in the <xref linkend="bootscripts"/> package
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| 198 | (as user <systemitem class="username">root</systemitem>):
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| 199 | </para>
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[4839c17] | 200 |
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[820d164a] | 201 | <indexterm zone="dhcpcd dhcpcd-init">
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| 202 | <primary sortas="f-dhcpcd">dhcpcd (service script)</primary>
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| 203 | </indexterm>
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| 204 |
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| 205 | <screen role='root'><userinput>make install-service-dhcpcd</userinput></screen>
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| 206 |
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[05c8448] | 207 | <note>
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| 208 | <para id="dhcpcd-config6">
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| 209 | the network service script <filename>/lib/services/dhcpcd</filename>
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| 210 | contained in bootscripts up to blfs-bootscripts-20191204 is
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| 211 | not compatible with latest dhcpcd, as the location of the pidfile
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| 212 | changed.
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| 213 | To work around this, issue the following command:
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| 214 |
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| 215 | <screen role='root'><userinput>sed -i "s;/run/dhcpcd-;/run/dhcpcd/;g" /lib/services/dhcpcd</userinput></screen>
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| 216 | </para>
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| 217 | </note>
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| 218 |
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[7c56ece] | 219 | <note>
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| 220 | <para id="dhcpcd-config3">
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| 221 | The default for <command>dhcpcd</command> is to set the hostname
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| 222 | and mtu. It also overwrites <filename>/etc/resolv.conf </filename>
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| 223 | and <filename>/etc/ntp.conf</filename>. These
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| 224 | modifications to system files are done by hooks which are stored in
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| 225 | <filename class="directory">/lib/dhcpcd/dhcpcd-hooks</filename>.
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| 226 | Setup <command>dhcpcd</command> by removing or adding hooks from/to
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| 227 | that directory. The execution of hooks can be disabled by using
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| 228 | the <option>--nohook</option> (<option>-C</option>) command line
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| 229 | option or by the <option>nohook</option> option in the
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| 230 | <filename>/etc/dhcpcd.conf</filename> file.
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| 231 | </para>
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| 232 | </note>
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[232e46a] | 233 |
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[7c56ece] | 234 | <para id="dhcpcd-config2">
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| 235 | Finally, as the <systemitem class="username">root</systemitem> user
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| 236 | create the <filename>/etc/sysconfig/ifconfig.eth0</filename>
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| 237 | configuration file using the following commands. Adjust appropriately
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| 238 | for additional interfaces:
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| 239 | </para>
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[4839c17] | 240 |
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[820d164a] | 241 | <indexterm zone="dhcpcd dhcpcd-config2">
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[f0740ab] | 242 | <primary sortas="e-etc-sysconfig-dhcpcd">/etc/sysconfig/ifconfig.eth0 (dhcpcd)</primary>
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[820d164a] | 243 | </indexterm>
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| 244 |
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[f0740ab] | 245 | <screen role='root'><userinput>cat > /etc/sysconfig/ifconfig.eth0 << "EOF"
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[820d164a] | 246 | <literal>ONBOOT="yes"
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[f0740ab] | 247 | IFACE="eth0"
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[afa198d] | 248 | SERVICE="dhcpcd"
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[5aac2b97] | 249 | DHCP_START="-b -q <replaceable><insert appropriate start options here></replaceable>"
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[f0740ab] | 250 | DHCP_STOP="-k <replaceable><insert additional stop options here></replaceable>"</literal>
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[820d164a] | 251 | EOF</userinput></screen>
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| 252 |
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[7c56ece] | 253 | <para>
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| 254 | For more information on the appropriate <envar>DHCP_START</envar> and
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| 255 | <envar>DHCP_STOP</envar> values, examine the man page for
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| 256 | <command>dhcpcd</command>.
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| 257 | </para>
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[4839c17] | 258 |
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[820d164a] | 259 | <indexterm zone="dhcpcd dhcpcd-config3">
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| 260 | <primary sortas="e-etc-resolv.conf">/etc/resolv.conf</primary>
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| 261 | </indexterm>
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| 262 | </sect3>
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[4839c17] | 263 |
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[3c7bd00] | 264 | <sect3 id="dhcpcd-init2" revision="sysv">
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[e5f38d6b] | 265 | <title>Configuration Information: fixed ip</title>
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| 266 |
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[7c56ece] | 267 | <para id="dhcpcd-config4">
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| 268 | Although not usual, it is possible that you need
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[e5f38d6b] | 269 | to configure <application>dhcpcd</application> to use a fixed ip. Here,
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| 270 | we give an example. As the
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| 271 | <systemitem class="username">root</systemitem> user create the
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| 272 | <filename>/etc/sysconfig/ifconfig.eth0</filename> configuration file
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| 273 | using the following commands. Adjust appropriately for additional
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[7c56ece] | 274 | interfaces and for the actual ip and router you need:
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| 275 | </para>
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[e5f38d6b] | 276 |
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| 277 | <indexterm zone="dhcpcd dhcpcd-config4">
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| 278 | <primary sortas="e-etc-sysconfig-dhcpcd">/etc/sysconfig/ifconfig.eth0 (dhcpcd)</primary>
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| 279 | </indexterm>
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| 280 |
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[7c56ece] | 281 | <screen role='nodump'><userinput>cat > /etc/sysconfig/ifconfig.eth0 << "EOF"
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[e5f38d6b] | 282 | <literal>ONBOOT="yes"
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| 283 | IFACE="eth0"
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| 284 | SERVICE="dhcpcd"
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| 285 | DHCP_START="-b -q -S ip_address=192.168.0.10/24 -S routers=192.168.0.1"
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| 286 | DHCP_STOP="-k"</literal>
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| 287 | EOF</userinput></screen>
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| 288 |
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[7c56ece] | 289 | <para>
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| 290 | You can either use DNS servers in
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[0840866] | 291 | <filename>/etc/resolv.conf</filename> from another system, your
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| 292 | preferred servers, or just the example
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[7c56ece] | 293 | <filename>/etc/resolv.conf.head</filename> file below as is:
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| 294 | </para>
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[e5f38d6b] | 295 |
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[7c56ece] | 296 | <screen role='nodump'><userinput>cat > /etc/resolv.conf.head << "EOF"
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[e5f38d6b] | 297 | <literal># OpenDNS servers
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| 298 | nameserver 208.67.222.222
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| 299 | nameserver 208.67.220.220</literal>
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| 300 | EOF</userinput></screen>
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| 301 |
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| 302 | </sect3>
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| 303 |
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[138bdf6] | 304 | <sect3 id="dhcpcd-init3" revision="systemd">
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| 305 | <title>General Configuration Information</title>
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| 306 |
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| 307 | <para>
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| 308 | If you want to configure network interfaces at boot using
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| 309 | <command>dhcpcd</command>, you need to install the
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| 310 | systemd unit included in <xref linkend="systemd-units"/>
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| 311 | package by running the following command as the
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| 312 | <systemitem class="username">root</systemitem> user:
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| 313 | </para>
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| 314 |
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| 315 | <screen role="root"><userinput>make install-dhcpcd</userinput></screen>
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| 316 |
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| 317 | <indexterm zone="dhcpcd dhcpcd-init3">
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| 318 | <primary sortas="f-dhcpcd">dhcpcd</primary>
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| 319 | </indexterm>
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| 320 |
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| 321 | <note>
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[7c56ece] | 322 | <para id="dhcpcd-config5">
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| 323 | The default behavior of <command>dhcpcd</command> is to set the
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| 324 | hostname and the mtu. It also overwrites <filename>/etc/resolv.conf
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| 325 | </filename> and <filename>/etc/ntp.conf</filename>. These
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| 326 | modifications to system configuration files are done by hooks which
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| 327 | are stored in <filename class="directory">
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| 328 | /lib/dhcpcd/dhcpcd-hooks</filename>. Setup <command>dhcpcd</command>
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| 329 | by removing or adding hooks from/to that directory. The execution
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| 330 | of hooks can be disabled by using the <option>--nohook</option>
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| 331 | (<option>-C</option>) command line option or by the
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| 332 | <option>nohook</option> option in the <filename>/etc/dhcpcd.conf
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| 333 | </filename> file.
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| 334 | </para>
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[138bdf6] | 335 | </note>
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| 336 |
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| 337 | <indexterm zone="dhcpcd dhcpcd-config5">
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| 338 | <primary sortas="e-etc-resolv.conf">/etc/resolv.conf</primary>
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| 339 | </indexterm>
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| 340 |
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[7c56ece] | 341 | <note>
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| 342 | <para>
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| 343 | Make sure that you disable the <command>systemd-networkd</command>
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| 344 | service or configure it not to manage the interfaces you want to
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| 345 | manage with <application>dhcpcd</application>.
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| 346 | </para>
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| 347 | </note>
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[138bdf6] | 348 |
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| 349 | <para>
|
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| 350 | At this point you can test if <command>dhcpcd</command> is
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| 351 | behaving as expected by running the following command as the
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| 352 | <systemitem class="username">root</systemitem> user:
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| 353 | </para>
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| 354 |
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| 355 | <screen role="root"><userinput>systemctl start dhcpcd@<replaceable>eth0</replaceable></userinput></screen>
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| 356 |
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| 357 | <para>
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| 358 | To start <command>dhcpcd</command> on a specific interface
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| 359 | at boot, enable the previously installed systemd unit by
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| 360 | running the following command as the
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| 361 | <systemitem class="username">root</systemitem> user:
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| 362 | </para>
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| 363 |
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| 364 | <screen role="root"><userinput>systemctl enable dhcpcd@<replaceable>eth0</replaceable></userinput></screen>
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| 365 |
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| 366 | <para>
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| 367 | Replace <replaceable>eth0</replaceable> with the actual interface name.
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| 368 | </para>
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| 369 |
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| 370 | </sect3>
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| 371 |
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[820d164a] | 372 | </sect2>
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[4839c17] | 373 |
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[820d164a] | 374 | <sect2 role="content">
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| 375 | <title>Contents</title>
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| 376 |
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| 377 | <segmentedlist>
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| 378 | <segtitle>Installed Program</segtitle>
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[d81eda8] | 379 | <segtitle>Installed Library</segtitle>
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[b1d305ed] | 380 | <segtitle>Installed Directory</segtitle>
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[4839c17] | 381 |
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[820d164a] | 382 | <seglistitem>
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| 383 | <seg>dhcpcd</seg>
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[81f1de4] | 384 | <seg>/lib/dhcpcd/dev/udev.so</seg>
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[2dcd27e] | 385 | <seg>/{,var/}lib/dhcpcd and /usr/share/dhcpcd</seg>
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[820d164a] | 386 | </seglistitem>
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| 387 | </segmentedlist>
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[4839c17] | 388 |
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[820d164a] | 389 | <variablelist>
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| 390 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
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| 391 | <?dbfo list-presentation="list"?>
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| 392 | <?dbhtml list-presentation="table"?>
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[4839c17] | 393 |
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[820d164a] | 394 | <varlistentry id="dhcpcd-prog">
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| 395 | <term><command>dhcpcd</command></term>
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| 396 | <listitem>
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[7c56ece] | 397 | <para>
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| 398 | is an implementation of the DHCP client specified in RFC2131.
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| 399 | </para>
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[820d164a] | 400 | <indexterm zone="dhcpcd dhcpcd-prog">
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| 401 | <primary sortas="b-dhcpcd">dhcpcd</primary>
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| 402 | </indexterm>
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| 403 | </listitem>
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| 404 | </varlistentry>
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[4839c17] | 405 |
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[81f1de4] | 406 | <varlistentry id="dhcpcd-udev">
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| 407 | <term><filename class="libraryfile">udev.so</filename></term>
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| 408 | <listitem>
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| 409 | <para>
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[c93c9bf4] | 410 | adds udev support for interface arrival and departure; this is
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[81f1de4] | 411 | because udev likes to rename the interface, which it can't do if
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| 412 | dhcpcd grabs it first.
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| 413 | </para>
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| 414 | <indexterm zone="dhcpcd dhcpcd-udev">
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| 415 | <primary sortas="c-dhcpcd-udev">udev.so</primary>
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| 416 | </indexterm>
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| 417 | </listitem>
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| 418 | </varlistentry>
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| 419 |
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[820d164a] | 420 | </variablelist>
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| 421 |
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| 422 | </sect2>
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[f45b1953] | 423 |
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| 424 | </sect1>
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