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<section xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xml:id="sec-ipv4">
<title>IPv4 Configuration</title>
<para>
By default, NixOS uses DHCP (specifically,
<literal>dhcpcd</literal>) to automatically configure network
interfaces. However, you can configure an interface manually as
follows:
</para>
<programlisting language="bash">
networking.interfaces.eth0.ipv4.addresses = [ {
address = &quot;192.168.1.2&quot;;
prefixLength = 24;
} ];
</programlisting>
<para>
Typically youll also want to set a default gateway and set of name
servers:
</para>
<programlisting language="bash">
networking.defaultGateway = &quot;192.168.1.1&quot;;
networking.nameservers = [ &quot;8.8.8.8&quot; ];
</programlisting>
<note>
<para>
Statically configured interfaces are set up by the systemd service
<literal>interface-name-cfg.service</literal>. The default gateway
and name server configuration is performed by
<literal>network-setup.service</literal>.
</para>
</note>
<para>
The host name is set using
<xref linkend="opt-networking.hostName" />:
</para>
<programlisting language="bash">
networking.hostName = &quot;cartman&quot;;
</programlisting>
<para>
The default host name is <literal>nixos</literal>. Set it to the
empty string (<literal>&quot;&quot;</literal>) to allow the DHCP
server to provide the host name.
</para>
</section>