Chapter 9. Network Configuration

Setup simply prompts for the hostname and the settings used during installation are written to the system. Many networks have a DHCP (Dynamic Host Configuration Protocol) service that automatically supplies connected systems with domain name, leaving the user to enter a host name. By default, Fedora activates all network interfaces on your computer and configures them to use DHCP.

Fedora contains complete support for both IPv4 and IPv6. By default, Fedora configures network interfaces on your computer for both IPv4 and IPv6 support, and to use DHCP over both IPv4 and IPv6. For more information about IPv6, refer to

Many home Internet routers and firewalls do not include support for IPv6. The default settings will not harm your system or router in any way. However, the speed of some services improves drastically if you disable IPv6 on any interface on a network that does not use IPv6.

[Tip] IPv6 and Boot Options

You can disable IPv6 support in the installation program using the boot option noipv6. The installation program does not configure network interfaces for IPv6 if you use this option. For more information on boot options, refer to Appendix A, Boot Options.

[Note] Modem Configuration

The Network Configuration screen does not list modems. Configure these devices after installation with the Network utility. The settings for your modem are specific to your particular Internet Service Provider (ISP).

9.1. Hostname

On some networks, the DHCP provider also provides the name of the computer, or hostname. The complete hostname includes both the name of the machine and the name of the domain of which it is a member, such as The machine name (or "short hostname") is machine1, and the domain name is

To set up a home network that is behind an Internet firewall or router, you may want to use hostname.localdomain for your Fedora system. If you have more than one computer on this network, you should give each one a separate host name in this domain.

[Tip] Valid Hostnames

You may give your system any name provided that the full hostname is unique. The hostname may include letters, numbers and hyphens.

If your Fedora system is connected directly to the Internet, you must pay attention to additional considerations to avoid service interruptions or risk action by your upstream service provider. A full discussion of these issues is beyond the scope of this document.