Connecting to AD over Ipsec

Our office site uses a Linksys rv042, remote site is on a Pfsense box,

office 10.170.50.1 remote 10.170.60.1

IPsec works,

is it possible to move our AD server to the remote site and use its IP (10.170.60.100) as a DNS for our PCs in 10.170.50.x network?

if yes are there any specific requirements for the IPSEC? routing? or a route that needs to be added to the client PCs? would i need a local DNS server for this?

thanks