Using Client Subnet in DNS Requests

BIG-IP DNS 14.0 now supports edns-client-subnet (ECS) for both responding to client requests (GSLB) or forwarding client requests (screening). The following is a quick start on using this feature. ...
Published Sep 14, 2018
Version 1.0
application delivery
BIG-IP DNS
Eric_Chen's avatar
Eric_Chen
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Sep 26, 2018

@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.