You gotta really know your Linux kernel and already know TCP/IP to understand this (Lord knows I don't, I use Linux like a moron uses a toaster) but try reading this monter http://iptables-tutorial.frozentux.net/iptables-tutorial.html and see if you get anywhere.
I know how to add IPS/ remove IPs but how do i remove every single IP, because i cant remember them all in inserted! Tyler