query limits

[Kris Voelker]

Is there a way to control/limit the number of queries that can be made by a
specific IP?  I've used the logging to track computers that are excessively
querying DNS.  (some individual computers to the tune of 25000 in a 2 hour
time span.)  Those using static IPs, I can block from further abuse.  The
problem I run into is with those using dynamic IPs.  Is there a way to get
BIND to stop responding to an IP that exceeds a set limit?  (rate control)
 

Thanks in advance.