Using Client Subnet in DNS Requests
Published Sep 14, 2018
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@leonardo. "dig" is your friend for testing (modern versions):
$ dig @203.0.113.13 test.example.com +short
203.0.113.250
$ dig +subnet=192.0.2.0/24 @203.0.113.13 test.example.com +short
192.0.2.2
You will also have to ensure that the DNS provider is sending ECS records. In the past I know that you had to register your BIG-IP DNS IPs with OpenDNS to have them forward ECS requests.