hidden DHCP parameters (next-server, filename) howto?

From:	"mirek" <onanos at hotpop dot com>
To:	<m0n0wall at lists dot m0n0 dot ch>
Subject:	hidden DHCP parameters (next-server, filename) howto?
Date:	Fri, 11 Feb 2005 23:47:16 +0100

Hello, I need to set m0n0wall as DHCP for remote booting. the TFTP will be
on other computer.  How to add those parameters to config.xml exactly? many
thanks for help
m0n0wall is best!