No? It's almost impossible to stop, Illegal or not. People send a lot of "packets" to cause lag to the other end. Them term "Dos" stands for "denial of service attack" where "ddos" is "distributed denial of service attack". The easiest way to get someone's IP is skype, there's free online skype resolvers that allow people the get IPs just simply by knowing their skype. Keep in mind, skype often puts out patches for these "bugs" but, as for everything, there's a way around it. That said, there's also ways around being resolved so easily.
