Ras+radius in Windows Server 2008

Experimental environment:

Windows Server 2008
Intranet IP 192.168.1.1	Extranet IP 8.8.8.8
Windows Server 2008 (NPS) IP 192.168.1.254
Windows XP analog Access side
IP Address: 8.8.8.4

RADIUS is a C/S architecture protocol whose client is originally a NAS (Net Access Server) server, and now any computer running RADIUS client software can become a RADIUS client. The RADIUS protocol authentication mechanism is flexible and can be used in a number of ways, such as PAP, chap or UNIX login authentication. RADIUS is an extensible protocol in which all of the work is done based on attribute-length-value vectors. RADIUS also supports vendors to expand proprietary properties of the manufacturer.
Because the RADIUS protocol is simple and clear, extensible, it has been widely used, including ordinary telephone network, ADSL Internet, Community broadband internet access, IP telephony, VPDN (virtual Private Dialup Networks, based on dial-up user's VPN business), Mobile phone prepaid fees and other services. Recently IEEE has proposed the 802.1X standard, which is a port based standard for access authentication for wireless networks and a RADIUS protocol for authentication.

Install Policy Access Service

Select Network Policy Server

Note: The server serves as radius please clear your mind to prevent the experiment from failing.