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Craig_13881's avatar
Craig_13881
Icon for Nimbostratus rankNimbostratus
Jul 25, 2011

Return DNS replies to specific clients

I'm trying to return DNS replies to only a couple of different subnets. If the request comes in from anything else, I'd like to ignore it, or return a bogus response. Trying to get this to work, but...
application delivery
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devops
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Craig_13881's avatar
Craig_13881
Icon for Nimbostratus rankNimbostratus
Jul 26, 2011
Got it! Had to change the "or" to an "and". I was never all that great with double negatives. 🙂

when DNS_REQUEST {
  if { !([IP::addr [IP::client_addr]/24 equals 10.0.0.0]) and !([IP::addr [IP::client_addr]/24 equals 172.16.1.0])   } {
   cname www.blahblahblah.com
     }
}
Thanks for you help.  This seems to be working perfectly!