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1<section xmlns="http://docbook.org/ns/docbook"
2 xmlns:xlink="http://www.w3.org/1999/xlink"
3 xmlns:xi="http://www.w3.org/2001/XInclude"
4 version="5.0"
5 xml:id="sec-ipv4">
6 <title>IPv4 Configuration</title>
7
8 <para>
9 By default, NixOS uses DHCP (specifically, <command>dhcpcd</command>) to
10 automatically configure network interfaces. However, you can configure an
11 interface manually as follows:
12<programlisting>
13<link linkend="opt-networking.interfaces._name__.ipv4.addresses">networking.interfaces.eth0.ipv4.addresses</link> = [ {
14 address = "192.168.1.2";
15 prefixLength = 24;
16} ];
17</programlisting>
18 Typically you’ll also want to set a default gateway and set of name
19 servers:
20<programlisting>
21<xref linkend="opt-networking.defaultGateway"/> = "192.168.1.1";
22<xref linkend="opt-networking.nameservers"/> = [ "8.8.8.8" ];
23</programlisting>
24 </para>
25
26 <note>
27 <para>
28 Statically configured interfaces are set up by the systemd service
29 <replaceable>interface-name</replaceable><literal>-cfg.service</literal>.
30 The default gateway and name server configuration is performed by
31 <literal>network-setup.service</literal>.
32 </para>
33 </note>
34
35 <para>
36 The host name is set using <xref linkend="opt-networking.hostName"/>:
37<programlisting>
38<xref linkend="opt-networking.hostName"/> = "cartman";
39</programlisting>
40 The default host name is <literal>nixos</literal>. Set it to the empty string
41 (<literal>""</literal>) to allow the DHCP server to provide the host name.
42 </para>
43</section>