I'd like to implement a time of day filter to effectively disable the Internet at certain times of the day. From what I gather, this isn't possible directly with pf; however, I need to use cron/crontab/at to switch over to new rules. This isn't conceptually difficult, but I am wondering if there is an alternative? Is it possible on ipfw / ipfilter? Or, is there a utility somewhere that already does this for pf (besides opnsense or pfsense)?