Implementing Client Subnet DNS Requests
Published Jun 16, 2015
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@alex. Not sure if you saw that this is now a feature in BIG-IP DNS 14.0 (I just updated this post to mention that as well). Using Client Subnet in DNS Requests.
 
If you are not running BIG-IP DNS 14.0; then you could potentially use a custom persist method with an iRule: K7392 talks about using HTTP URI, but you could use the string value from eDNS in theory. I haven't thought it through fully, so not sure that would work.