6
I'd be interested in knowing what sats modules you tried.
Here's the problem, and very few really understand how this all works...If this person is spoofing, you will have a hard time with IP's. Protector is not good enough for that, and although you might be able to find a range of IP's by looking at your access logs, you may not be able to block him specifically.
So, what to do? Well, one thing is to actually look at those logs on your server and figure out what posts are associated with what IP addresses. If you have control over your server, you could install the mod-security module and set up filters. However, my bet is if you study the access logs, you will find a trend. If nothing else, you will find what IP addresses he likes to spoof. Unfortunately, there are no real reliance on the IP coming in.
I only have an interest because I like to actually find these folks and sell them out to everyone. I've done it many times!