Implementing Client Subnet DNS Requests

Problem this snippet solves: Update 2018-10-23: As of BIG-IP DNS 14.0 there is now a checkbox feature for edns-client-subnet. Please see: Using Client Subnet in DNS Requests. The following is stil...
Published Jun 16, 2015
Version 1.0
BIG-IP DNS
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iRules
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Eric_Chen
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Oct 23, 2018

@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.