I followed this tutorial to set up IP rules on ubuntu 12.04. Everything worked fine on setup -- but now I've made changes to the firewall that do not persist upon reboot. I do not understand why that is. Here is a demonstration of how I am using iptables-persistent. What am I doing wrong?
$ sudo service iptables-persistent start * Loading iptables rules... * IPv4... * IPv6... $ sudo iptables -L //shows a certain rule $ iptables -D INPUT ... //command successfully drops the rule $ sudo iptables -L //shows rule has been deleted $ sudo service iptables-persistent restart * Loading iptables rules... * IPv4... * IPv6... [ OK ] $ sudo iptables -L //rule is back