Simple spam protection

Download and install connlimit modules
http://sevengeekwonders.guecks.com/?p=71" target="_blank
(im dont found connlimit modules in contribute)
and simple

iptables -A FORWARD -p tcp ! -d XX.XX.XX.XX --dport smtp -m connlimit --connlimit-above 1 -j DROP

Sorry for my english

I'm trying to use connlimit

I'm trying to use connlimit but it doesn't work 4me.
All I have to do is copy the modules to the router right?
When trying to insmod I get an error, see: http://www.coova.org/node/3944
Hope you can help me out.

many tnx
B