Ubuntu Networking :: Iptables Do Not Work The Way It Should On 10.04?

i'm having a weird issue on 10.04. I have a bash script I wrote to drop incoming connections that are faster than a specified rate (6 per second in the example). I've been using the script successfully on 8.04LTS and CentOS for 2-3 year but it doesnt seem to work on 10.04

Code:
INTERVAL="2"
HITCOUNT="6"
iptables -A INPUT -d 123.123.123.123 -m state --state NEW -m recent --set
iptables -A INPUT -d 123.123.123.123 -m state --state NEW -m recent --update --seconds $INTERVAL --hitcount $HITCOUNT -j DROP