Using Client Subnet in DNS Requests
Published Sep 14, 2018
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The external part that complicates the test, I could do with internal names/DNS/IPs, but that is why I said I don't have an easy way.
F5 PD could have been a little bit more friendly, providing extra information. :P
https://support.f5.com/kb/en-us/products/big-ip_ltm/releasenotes/product/relnote-bigip-14-0-0.html "Support for EDNS0 For this release, the BIG-IP system now supports certain functionality associated with the Extended DNS (EDNS0 or EDNS) client subnet option."
Based on the number of comments so far, you can see this is a very helpful improvement for GTM.
Anyway, let's wait for @mwalkup69 tests.