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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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The_Bhattman's avatar
The_Bhattman
Icon for Nimbostratus rankNimbostratus
Jul 26, 2011
Hi Craig,

If you look to provide a bogus response from the GTM based on it hitting a specific wide IP then you can do the following 

when DNS_REQUEST {
  if { !([IP::addr [IP::client_addr]/24 equals 10.0.0.0/24]) or !([IP::addr [IP::client_addr]/24 equals 192.168.76.0/24]) } {
   cname www.blahblahblah.com
     }
}

I hope this helps

Bhattman