Blacklisting Badguys With IPTables
Anyone that has run a server on the Internet for any length of time quickly learns that the Internet is full of spammers, bots, and other characters you would prefer didn't exist. One way to keep them at bay is to use blacklists with IPTables. In this talk we'll look at several sources of blacklists and how to efficiently incorporate blacklists into Linux IPTables to effectively mass block IP addresses and protect systems.
Short Link: http://lfnw.org/node/4454