source: chapter07/iproute2.xml@ f286505

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
  "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
  <!ENTITY % general-entities SYSTEM "../general.ent">
  %general-entities;
]>

<sect1 id="ch-tools-lo" role="wrap">
  <?dbhtml filename="lo-iface.html"?>

  <sect1info condition="script">
    <productname>iproute2</productname>
    <productnumber>&iproute2-version;</productnumber>
    <address>&iproute2-url;</address>
  </sect1info>

  <title>Setting Up Loopback Network Interface with IPRoute-&iproute2-version;</title>

  <indexterm zone="ch-tools-lo">
    <primary sortas="a-IPRoute2">IPRoute2</primary>
    <secondary>tools</secondary>
  </indexterm>

  <sect2 role="package">
    <title/>

    <para>The IPRoute2 package contains programs for basic and advanced IPV4-based
    networking. Now we need <command>ip</command> from it to bring up
    loopback network interface, which is expected by the testsuites of
    various packages.</para>

    <segmentedlist>
      <segtitle>&buildtime;</segtitle>
      <segtitle>&diskspace;</segtitle>

      <seglistitem>
        <seg>&iproute2-tmp-sbu;</seg>
        <seg>&iproute2-tmp-du;</seg>
      </seglistitem>
    </segmentedlist>

  </sect2>

  <sect2 role="installation">
    <title>Use IPRoute2 to Set Up Loopback Network Interface</title>

    <para>Compile the package:</para>

<screen><userinput remap="make">PKG_CONFIG=false make SUBDIRS='lib ip'</userinput></screen>

    <variablelist>
      <title>The meaning of the environment and overriden make
      variables:</title>

      <varlistentry>
        <term><parameter>PKG_CONFIG=false</parameter></term>
        <listitem>
          <para>The building system attempts to find dependencies with
          <command>pkg-config</command>, which is not installed yet.
          We can override it since <command>ip</command> utility does not
          need these dependencies.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><parameter>SUBDIRS='lib ip'</parameter></term>
        <listitem>
          <para>Only build the <command>ip</command> utility from the
          package and disable the build of other utilities.  This is needed
          to prevent a build failure due to the lack of some
          dependencies.</para>
        </listitem>
      </varlistentry>
    </variablelist>

    <para>It's not needed to install the <command>ip</command> utility now.
    Just bring up the loopback interface:</para>

<screen><userinput remap="install">ip/ip link set lo up</userinput></screen>

    <para>Verify the result:</para>

<screen><userinput remap="install">ip/ip addr</userinput></screen>

    <para>The command above should show <literal>127.0.0.1/8</literal>
    as the IPv4 address of <literal>lo</literal>, and
    <literal>::1/128</literal> as the IPv6 address.</para>

  </sect2>

  <sect2 role="content">
    <title/>

    <para>Details on this package are located in <xref linkend="contents-iproute2" role="."/></para>

  </sect2>

</sect1>