Install the dhcp port:

cd /usr/ports/net/isc-dhcp3

make install

make clean

backup and restore the following files:

/usr/local/etc/dhcpd.conf

setup the startup script:

mv /usr/local/etc/rc.d/isc-dhcpd.sh.sample /usr/local/etc/rc.d/dhcpd.sh

add 'fxp0' to interfaces in /usr/local/etc/rc.d/dhcpd.sh

move other configs and scripts to your backup directory

add log entry for local7 to /etc/syslog.conf:

add log entry for dhcpd.log into newsyslog.conf

create the logfile:

touch /var/log/dhcpd.log