DNS Failover

[billybong]

Hi Guys, i don't think this possible but i thought i'd ask

I've been asked if at a remote site we can add a primary DNS and have a failover DNS but would it possible for the DNS to fail back to primary once it comes back online

[balaji.bandi]

it is all how you configure and tweak the config.

some basic question addressed here :

https://ns1.com/resources/dns-failover-basic-concepts-and-limitations

[billybong]

Thanks for the reply Balaji, on further investigation this is the current setup

The Dns is provided to the remote site via a vpn (ASA to ASA)

what we want to happen is if the vpn goes down, can we failover to a public dns service like googles dns, once the vpn is back up can the dns fail back to original vpn dns 

[balaji.bandi]

its all how your setup and DNS order going to be.

[billybong]

Sorry Balaji i don't understand, round robin won't work for us if thats what you mean

[balaji.bandi]

i may be not asked before, is this for only DNS Resolution, then why not setup Local DNS Server, even VPN break you still have DNS Servers available locally ?

The Dns is provided to the remote site via a vpn (ASA to ASA)  - Most people have redundant VPN Setup if the business more rely on your application and DNS.

if that is not possible you need to setup Local DNS Server. is this what you can do ?