I am doing an experiment with my computers, networks, and virtual machines. Right now, when I scan I get the response, all ports are filtered. I'm attacking a xp machine and linksys router for this experiment. That's when using -PN with nmap. Once upon a time ago, I saw an attack against the computer I was in front of make several repeated attacks very fast in a row bring down the the software firewall. That software was alerting me continuously until it crashed. Tell me, what DOS attacks still work today? I've read online about them, but they are too vague. They aren't telling specifically how to do it but rather how it works, and they very well may be patched against today. Thanks.