Question : Site to site login

I have a remote office with a member server which has been on the domain in my main office before sighting in my remote office.
I have a VPN up and running between both sites and can ping both sites for each site by IP address but not DNS name, I would like to be able to login to the main domain from the remote site for the member server but can’t seem to get it to see the main site, what am i doing wrong, they are on different subnets on is and the other is  

Answer : Site to site login

at the remote site, if you set the DNS to the main site server, are you able to log in?

For example: AD server at the main site

Remote site:
IP: /24

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