Thanks Michel, does that mean that if I setup my own DNS then I would have to add the IP to the list of name servers at my registrar?

>>This morning one of my web sites has quit working because my registrar is under a DDoS attack. I have been thinking about how to stop this from happening in the future and one idea I had was to find a name server that has no affiliation to my registrar that I could use. I have limited knowledge of how name servers work so is this a good option? Any other ideas? I really don't want to change registrar but that will be my last option.
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>I believe if you host your DNS elsewhere than that location, it would then not had been affected by that.