I think you guys might find this intersting....
http://grc.com/steve.htm
Spoofarino — holding ISP's accountable
Spoofarino will be a simple end-user utility to determine whether ISPs are allowing Internet packets containing fraudulent return addresses (spoofed source IPs) to escape onto the public Internet. It is another of the applications that has been dependent upon the availability of the NanoProbe technology.
