[Appendix D] D.2 The dhcpd Command
Appendix DA dhcpd Reference D.2 The dhcpd CommandThe syntax of the dhcpd command is:dhcpd [-p port] [-f] [-d] [-cf config-file] [-lf lease-file] [if0 [...ifn]]dhcpd usually is run without any command-line arguments. Most of
the arguments are used only when testing and debugging. Two of the
command-line arguments handle special configuration requirements:-fRuns dhcpd in foreground mode. By default, dhcpd runs as
a background daemon process. Use -f when dhcpd is started
from inittab on a System V UNIX system.if0 [...ifn]Lists the interfaces on which dhcpd should listen for BOOTREQUEST
packets. This is a whitespace-separated list of interface names.
For example, dhcpd ec0 ec1 wd0 tells dhcpd to listen to
interfaces ec0, ec1, and wd0. Normally this argument is not required.
In most cases dhcpd locates all installed interfaces and eliminates
the non-broadcast interfaces automatically. Use this argument only if
it appears that dhcpd is failing to locate the correct interfaces.All of the remaining command-line arguments are used for debugging
or testing:-p portCauses dhcpd to listen to a non-standard port. The well-known port
for DHCP is 67. Changing it means that clients cannot talk to the server.
On rare occasions this is done during testing.-dRoutes error messages to stderr. Normally error messages are written
via syslog with facility set to DAEMON.-cf config-fileCauses dhcpd to read the configuration from the file identified
by config-file instead of from dhcpd.conf. Use this only
to test a new configuration before it is installed in dhcpd.conf.
Use the standard file for production.-lf lease-fileCauses dhcpd to write the address lease information to the file
identified by lease-file instead of to dhcpd.leases. Use this
only for testing. Changing the name of the lease file could cause dynamic
addresses to be misallocated. Use this argument with caution.Kill the dhcpd daemon with the SIGTERM signal. The process ID (PID)
of the dhcpd daemon is found in the /var/run/dhcpd.pid file.
For example:# kill -TERM 'cat /var/run/dhcpd.pid'dhcpd uses three files. dhcpd writes its PID to
/var/run/dhcpd.pid.
It maintains a record of dynamic address leases
in /var/db/dhcpd.leases, and dhcpd reads its configuration
from /etc/dhcpd.conf. These last two files are created by you.
Create an empty lease file before you run dhcpd the first time,
e.g., touch /var/db/dhcpd.leases. Create a configuration and
store it in dhcpd.conf.D.1 Compiling dhcpdD.3 The dhcpd.conf Configuration File[ Library Home | DNS & BIND | TCP/IP | sendmail | sendmail Reference | Firewalls | Practical Security ]
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