|The silent network: denying the spam and malware chatter using free tools: BSDCan, Ottawa, May 18th 2007
The free tools work, and you can make a difference.
Stopping the noise at the perimiter seems to preferable
The open source development model produces high-performance, low maintenance, flexible tools
The bad guys are having to try harder.
By studying our adversaries' behavior patterns we have trapped them, and we may just be starting to win.