name servers getting slammed

For some reason about 3 days ago the bandwidth (viewed in bandmin) on my name servers have gone from 5 meg a day to now over 1.5 gig a day and I have seen my .named process running consistently between 3.0 and 5.0% in top for extended times.

Is there an easy way to see who is hitting my name server so hard or what might be causing this? Also wht is the best way to block the unwanted use?

Thanks!

 

 

 

 

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