DNS Attack

[Roman Gelfand <rgelfand2@xxxxxxxxx>]

I have setup squid server to function as both forward and reverse
proxy.  It appears that I am getting flooded with http requests with
non existant urls.  Consequently, this slows down my firewall as the
dns server is slowing down the query response.  Is there a way to
prevent dns lookup if url doesn't match the pattern?

Thanks in advance