I followed this: How to save rules of the iptables?
And created this "/etc/iptables.rules":
# Generated by iptables-save v1.4.12 on Sun May 19 18:42:18 2013
*filter
:INPUT ACCEPT [429624:571594561]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [174081:16941855]
[0:0] -A INPUT -s 173.194.55.0/24 -j REJECT --reject-with icmp-port-unreachable
[0:0] -A INPUT -s 206.111.0.0/16 -j REJECT --reject-with icmp-port-unreachable
COMMIT
# Completed on Sun May 19 18:42:18 2013
How do I know this is being used?