Active Directory over site-to-site

Good Evening All,

What would be the right method to…relay?..forward?..pass?..Active Directory over a site-to-site VPN?

Essentially, we have our primary location with an Active Directory domain, and are getting a second physical location where we would like to have a VPN established from location B to location A, and have RADIUS authentication with AD still occur from our main AD server.

Is there a way to have a local relay, or even just something in the firewall to push this AD traffic to the server on location A’s network over the VPN?

Thank you!