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1# IPv4 Configuration {#sec-ipv4}
2
3By default, NixOS uses DHCP (specifically, `dhcpcd`) to automatically
4configure network interfaces. However, you can configure an interface
5manually as follows:
6
7```nix
8networking.interfaces.eth0.ipv4.addresses = [ {
9 address = "192.168.1.2";
10 prefixLength = 24;
11} ];
12```
13
14Typically you'll also want to set a default gateway and set of name
15servers:
16
17```nix
18networking.defaultGateway = "192.168.1.1";
19networking.nameservers = [ "8.8.8.8" ];
20```
21
22::: {.note}
23Statically configured interfaces are set up by the systemd service
24`interface-name-cfg.service`. The default gateway and name server
25configuration is performed by `network-setup.service`.
26:::
27
28The host name is set using [](#opt-networking.hostName):
29
30```nix
31networking.hostName = "cartman";
32```
33
34The default host name is `nixos`. Set it to the empty string (`""`) to
35allow the DHCP server to provide the host name.