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dns-dhcp(1)		     General Commands Manual		     dns-dhcp(1)

NAME
     dns-dhcp - generate dhcp tables from DNS tables

SYNOPSIS
     dns-dhcp [ option...  ][ infile [ outfile ]]
     dns-dhcp -Help
     dns-dhcp -VERSion

DESCRIPTION
     The  dns-dhcp  program  is  used to generate portions of the /etc/dhcp.conf
     file from the forward DNS tables, augmented with ``ether a'' entries.

     This is supplemented with an additional ``dhcp'' class, so that  extra  in-
     formation may be defined.

     The output format is described in the dhcpd (8) manual entry.  Usually, the
     output  of  the  dns-dhcp command is included into the /etc/dhcp.conf file,
     rather then define the entire file with the output in the dns-dhcp command.

DHCP TYPES
     The ``dhcp'' class has the following defined types:

     filename
	 The absolute path of the bootfile.

THE * DEFAULT
     The special host name ``*'' may be used to specify defaults.  These may  be
     over-riden by specific entries.  The most recently see default of each type
     name  is  remembered.  This may be exploited, for example, to set different
     servers and gateways for different networks.

OPTIONS
     The following options are understood:

     -Help
	     Provide some help with using the dns-dhcp program.

     -VERSion
	     Print the version of the dns-dhcp program being executed.

     All other options will produce a diagnostic error.

EXAMPLE
     The idea is that you have all of the information concerning  each	computer
     in the one file.  This makes it less likely that something will be omitted,
     and simpler to change if the name or IP address changes.

     Given a database file called ``example.com'' and which contains the follow-
     ing text
     You can generate the /etc/dhcp.conf file using the following command
	    % dns-dhcp example.com /etc/dhcp.conf
	    %
     Here is what you would see as the output
     Note that the output uses relative names.

   Makefile
     All of this can be automated using the following makefile fragment:
	    /etc/dhcp.conf: example.com
		    dns-dhcp example.com $@
     By doing this, all you need to do is edit the example.com file, and the use
     the make(1) command to bring everything up-to-date.

     If  you were using NIS, NIS+ or LDAP you would update them, rather than the
     static file.

Reference Manual		     dnsutl			     dns-dhcp(1)

Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=dns-dhcp&sektion=1&manpath=FreeBSD+Ports+15.1.quarterly>

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