you might want to enable BOOTTP on the RRAS server to allow clients to obtain IP address from your DHCP server instead of RRAS server. that way you'll get the DHCP configuration settings for client computers which includes the options you've set like DNS, Routers [gateway],WINS, etc. Without those, remote access clients don't know where to look for DNS servers on the net and RRAS doesn't supply the A records or PTR records to remote clients. open up RRAS and right click on your server name. choose properties. Enable RRAS as either a "Router" to route traffic OR as a "Remote Access Server" depending upon how you have your network setup. I'll assume you have RRAS setup as a "Remote Access Server". Next, click on IP tab and make sure that the Enable IP routing and Allow IP based remote access is checked. Also check the IP assignment DHCP and choose the adapter you will use for DHCP, DNS WINS clients [LAN adapter in a multihomed setup]. Next expand IP routing and right click DHCP relay agent. choose properties. Add in the IP address of your LAN DHCP server.
Next, configure your remote access policy. Note that policies are executed in the list from top to bottom. First policy shown is first policy executed. Also for security sake make the policies order most restrictive to least restrictive. Else if least restrictive is first then everyone and their mother, the pet dog, and unknown entities from beyond can access.
Finally , make sure port 1723 both udp and tcp are open both inbound and outbound direction and GRE port 47 on any access servers / perimeter firewalls.
