Using F5 DNS for Internal

Hi Thanh_Tien - I see that your post hadn't gotten a response yet, and just wanted to let you know that I've asked a colleague to jump in with an answer for you. 

This is the easiest way to get this done. I have personally configured this in a Tier 1 Service Provider mobility environment, so I can tell you that performance is QUITE high, when tuned appropriately with a udp profile.

This also allows you to add a full proxy caching dns firewall in front of your AD DNS.

https://techdocs.f5.com/en-us/bigip-14-0-0/big-ip-dns-implementations-14-0-0/placing-big-ip-dns-in-front-of-a-pool-of-dns-servers.html#GUID-0C8CFA90-5854-4282-B5E6-EBA13ADFF069

FYI, AubreyKingF5 will post an answer for you tomorrow. 

Sorry for the delay. I was certain I posted this here on the same day I made the video to answer the question.

Checking back to make sure you're good on this. Have you tried or tested this solution yet? It's far easier than secondarying and we run this architecture for BIND, Infoblox, AD.. you name it.