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Appendix C. Additional Linux installation configuration options 537

Configuring a BOOTP or DHCP service

DHCP is an extension to the original BOOTP specification. As a result, you can

use DHCP to provide the BOOTP information for booting using the network. The

standard DHCP daemon is called

dhcpd, but there are other DHCP daemons.

The standard DHCP daemon is configured through two files: The

/etc/sysconfig/dhcpd file, which stores the basic configuration, and the

/etc/dhcpd.conf file, which contains the configuration information for each

registered client. For a running service, the configuration actually used in most

cases is copied in a subdirectory of /var/. See Example C-1 for a simple client

configuration stored in dhcpd.conf.

Example: C-1 dhcpd.conf example

ddns-update-style none;

allow booting;

allow bootp;

always-reply-rfc1048 true;

shared-network TEST {

Note: The directory you use for the configuration files depends on the

distribution. The following directories are possible examples:

򐂰 /etc/

򐂰 /etc/sysconfig/

򐂰 /etc/default/

򐂰 /etc/xinet.d/ (eXtended InterNET daemon configuration files)

The examples in this appendix use the most common directories. In general,

the name of a configuration or script file is related to the name of the installed

package. For example, if a DHCP daemon is called dhcpd3-server, you can

find the configuration in /etc/dhcpd3-server.conf and

/etc/sysconfig/dhcpd3-server, and the start/stop script is in

/etc/init.d/dhcp3-server.

Note: Keep in mind that Example C-1 contains environment-specific Internet

Protocol (IP) and Media Access Control (MAC) address information. One way

to learn the MAC address of a JS23 BladeCenter is to use the BladeCenter

management module. Select Monitors → Hardware VPD from the left-side

options and then click your blade bay and then the Ports tab on the right side.

For more information about how to customize dhcpd.conf, see the man pages

of the dhcpd service and use man dhcpd on the command prompt.

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