Single Direct Access Server 2016

Hi,

Being new to Direct Access I have a question regarding amending a current configuration.

We have a single DA Server sat in a domain where we have added a new domain controller, the domain controller is not part of the DA config and is sat in another geographical site on the same network, we would like to add this for Domain Services and  DNS redundancy .  Is their an easy way to add this or do we require a rebuild?

Thanks

TC