If you want to increase your security in a heavy-handed, vicious manner that upper management can't fault, krfilter is for you. :) This tool comes with a canned list of netblocks assigned to Korea, China, Hong-Kong, Taiwan, India, and Indonesia, so getting rid of 3/4 of your script kiddie problem is just a few more mouse-clicks away!

Krfilter - Across the board increase in security!