How does one guarantee a remote client the same local IP address every time when connecting to a VPN

You might consider running RRAS + PPTP on your Win2k8 DC and just forwarding the necessary ports through. It's much, much easier to do access control from within AD that way. That's how my company set it up and it works very well. YMMV.

Have a look here for some guidance. It's called "Active Directory Certificate Services" (ADCS)

Reviewers: I would post the full details of the link, but it's quite large.

The Basic steps:

1. Log on to TEST_PKI1 as a domain administrator.

2. Click Start, point to Administrative Tools, and then click Server Manager.

3. In the Roles Summary section, click Add roles.

4. On the Select Server Roles page, select the Active Directory Certificate Services check box. Click Next two times.

5. On the Select Role Services page, select the Certification Authority check box, and then click Next.

6. On the Specify Setup Type page, click Enterprise, and then click Next.

7. On the Specify CA Type page, click Root CA, and then click Next.

8. On the Set Up Private Key and Configure Cryptography for CA pages, you can configure optional configuration settings, including cryptographic service providers. However, for basic testing purposes, accept the default values by clicking Next twice.

9. In the Common name for this CA box, type the common name of the CA, RootCA1, and then click Next.

10. On the Set the Certificate Validity Period page, accept the default validity duration for the root CA, and then click Next.

11. On the Configure Certificate Database page, accept the default values or specify other storage locations for the certificate database and the certificate database log, and then click Next.

12. After verifying the information on the Confirm Installation Options page, click Install.

13. Review the information on the confirmation screen to verify that the installation was successful.