I have built a test environment as shown in the diagram. In the rest of the howto, the configurations of software are based on this topology.
A Windows 2003 SP1 Server is set up as the AD domain controller, DNS server and WINS server. The pptp gateway is the Linux box which has 2 network cards. One connects to the internal network, 10.0.0.0/24, and the other one connects to the Internet with ip address 192.168.0.10/24. The internal network has two subnets, 10.0.0.0/24 and 172.16.0.0/24.
The domain name of the Windows AD domain is EXAMPLENET.ORG and the corresponding netbios name is EXAMPLE.
Windows Domain Summary:
| Domain Controller Name | dc1.examplenet.org |
| Domain Controller IP Address | 10.0.0.1 |
| DNS IP Address | 10.0.0.1 |
| WINS IP Address | 10.0.0.1 |
| AD Domain Name | examplenet.org |
| AD Netbios Domain Name | example |