IP spoofing can be prevented by ISPs[1] but I don't thing there is an incentive for them to do it. That could not stop the NSA anyway. [1]: http://security.sta

IP spoofing can be prevented by ISPs[1] but I don't thing there is an incentive for them to do it. That could not stop the NSA anyway. [1]: http://security.stackexchange.com/questions/1062/why-dont-isps-filter-on-source-address-to-prevent-spoofing http://security.stackexchange.com/questions/1062/why-dont-is...