A handy little cron command for Ubuntu is @reboot. For some reason I am too lazy to research properly I kept getting
[psad-status] firewall setup warning
on startup. Not hard to fix, but annoying. So creating a quick script to run
/sbin/iptables -A FORWARD -j LOG
/sbin/iptables -A INPUT -j LOG
and call it from crontab with
does the trick.