NSTL Tests Windows 2000 VPN

Microsoft Corp. today announced that National Software Testing Laboratory Inc. (NSTL) testing demonstrated that Windows 2000 can support both 5,000 simultaneous point-to-point tunneling protocol (PPTP) and 5,000 simultaneous layer two tunneling protocol (L2TP/IPSec) virtual private networking (VPN) connections.

The NSTL ( tests were done on a four-processor Intel Xeon 550MHz system with 1 GB of RAM, Windows 2000 Advanced Server and Intel Pro/100 S Server adapters for IPSec encryption offload.

Microsoft ( claims these numbers are two to five times the number of tunnels than other server-based VPNs at this level of performance.

According to the testing, the server-based Microsoft Windows 2000 VPN costs as low as $5 per connection.

"NSTL proves that Windows 2000 Advanced Server can deliver scalability without compromising on price or performance," said Deborah Willingham, vice president of Windows Marketing at Microsoft in a statement.

Results also show site-to-site performance as high as 70 Mbps using L2TP/IPSec protocol.

For remote-access connections, the tests showed that such a system can support 5,000 simultaneous users at typical remote-access loads through 56Kbps links. Details regarding the NSTL testing can be found at

The Windows 2000 Server operating system includes a VPN gateway, authentication, and policy management and deployment tools out of the box. Reporting, accounting and trend analysis from Telco Research Corp. ( is also included as part of the resource kit. – Thomas Sullivan

About the Author

Scott Bekker is editor in chief of Redmond Channel Partner magazine.