Installing and Administering Internet Services

Chapter 6 203
DHCP
Configuration Files
Configuration Files
Two configuration files, bootptab and dhcptab, are used for your
DHCP configuration. These files are written to when you perform
configuration through SAM. You can also manually edit these files if
desired, although most of your work will probably be performed using
SAM.
The bootptab file contains configuration information for old BOOTP
clients as well as DHCP clients with fixed IP addresses. The bootptab
file also contains configuration for relay agents.
The dhcptab file contains configuration information for DHCP groups,
where clients are assigned IP addresses from a pool of currently unused
addresses.
Options
Two options within the bootptab and dhcptab files you may want to be
aware of are the t and v options.
The t option allows you to set specific values for optional DHCP
parameters. Most optional parameters are configurable through SAM
and are shown and described (through on-line help) on the corresponding
SAM screen, but some additional optional parameters can be specified
only by editing the option of the appropriate configuration file.
The v option is for DHCP clients and is used to configure vendor-specific
options.
Migration
Because of the easy IP address allocation made possible by DHCP, you
may want to convert old BOOTP clients to become DHCP clients. From
the server perspective, this can be accomplished by using the
allow-bootp-clients option of the bootpd(1M) command. You can
refer to this man page for detailed information. In short, you can make
an old BOOTP client part of a DHCP group that has been defined.
bootpd is the internet boot protocol server daemon that implements
DHCP, BOOTP, and DHCP/BOOTP relay agents.