Open the Perl file in a text editor and change the constants to reflect the day that your billing cycle starts and the monthly cap to your bandwidth. (It may be advisable to lowball your cap by 1/31st of the cap to be safe). THIS IS CURRENTLY IN INTERNAL TESTING ONLY AND COMES WITH ABSOLUTELY NO WARRANTY WHATSOEVER. DO NOT RUN THIS ON ANY PRODUCTION SYSTEM. I AM NOT RESPONSIBLE IF THIS BRICKS OR BURNS OUT YOUR ROUTER. IF TURTLES ATTACK YOU WITH A SLOW LASER OF VENGEANCE, THAT WAS ME. ANYTHING ELSE YOU HOLD YOURSELF RESPONSIBLE FOR.