To have IP Freely start on boot up, you can add the following to /etc/rc.local:
(Be sure to change localhost:port and remotehost:port)

if [ -x ${PREFIX}/sbin/ipfreely ]; then
        echo -n ' ipfreely'
        ${PREFIX}/sbin/ipfreely \
        -b localhost:port \
        -r remotehost:port \
        -u _ipfreely \
        -c /var/empty/
fi