Basically, the VPN Server acts like a DHCP Server for incoming VPN clients. It'll be assigned an IP address within the range you provided, and then it’s told where to go for DNS services. These values are provided to an incoming VPN client, on joining the local private network.
If you’re running VPN Enabler on the single machine on the local network, behind the router, that has all the Internet services loaded on it (e.g., web, mail & DNS server, all on one machine), which is quite a reasonable assumption for the user base that is running all my “enabler” apps, then when you click on that “Suggest IP Addresses” button, it’ll try to provide you with reasonable values that you can use.
Then, look for the “Suggest IP Addresses” button. Of course, this host name or domain name must be accessible from the Internet. You only need to provide the Host Name for your VPN Server. VPN Enabler now supports both L2TP and PPTP protocols. What VPN Enabler does is to do all that stuff for you in just three (OK, maybe four) steps and just one click. There is a VPN Server built into every plain Mac OS X machine, only it's not activated unless you know how to type in a lot of geeky commands and dive into a lot of configuration files.
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