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# IPv4 Configuration {#sec-ipv4}
By default, NixOS uses DHCP (specifically, `dhcpcd`) to automatically
configure network interfaces. However, you can configure an interface
manually as follows:
```nix
networking.interfaces.eth0.ipv4.addresses = [ {
address = "192.168.1.2";
prefixLength = 24;
} ];
```
Typically you'll also want to set a default gateway and set of name
servers:
```nix
networking.defaultGateway = "192.168.1.1";
networking.nameservers = [ "8.8.8.8" ];
```
::: {.note}
Statically configured interfaces are set up by the systemd service
`interface-name-cfg.service`. The default gateway and name server
configuration is performed by `network-setup.service`.
:::
The host name is set using [](#opt-networking.hostName):
```nix
networking.hostName = "cartman";
```
The default host name is `nixos`. Set it to the empty string (`""`) to
allow the DHCP server to provide the host name.
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