14.3. Configuring a DHCP Client

To configure a DHCP client manually, modify the /etc/sysconfig/network file to enable networking and the configuration file for each network device in the /etc/sysconfig/network-scripts directory. In this directory, each device should have a configuration file named ifcfg-eth0, where eth0 is the network device name.
Make sure that the /etc/sysconfig/network-scripts/ifcfg-eth0 file contains the following lines:
DEVICE=eth0
BOOTPROTO=dhcp
ONBOOT=yes
To use DHCP, set a configuration file for each device.
Other options for the network script include:
  • DHCP_HOSTNAME — Only use this option if the DHCP server requires the client to specify a hostname before receiving an IP address.
  • PEERDNS=<answer>, where <answer> is one of the following:
    • yes — Modify /etc/resolv.conf with information from the server. If using DHCP, then yes is the default.
    • no — Do not modify /etc/resolv.conf.
If you prefer using a graphical interface, refer to Chapter 8, NetworkManager for instructions on using NetworkManager to configure a network interface to use DHCP.

Advanced configurations

For advanced configurations of client DHCP options such as protocol timing, lease requirements and requests, dynamic DNS support, aliases, as well as a wide variety of values to override, prepend, or append to client-side configurations, refer to the dhclient and dhclient.conf man pages.