Overview of VPN Technologies :: essays research papers

Multi-vendor interoperability for virtual private networking is essential in todays networking environment due to the nature of line of work acquisitions, the need to extend corporate networks to contractors and partners, and the diverse equipment within company networks. To ensure customers have an open solution, Microsoft Windows Server 2003-based VPN technology is based on industry standards. By supporting IETF industry standards, Microsoft delivers a VPN solution that will work with other standard-compliant devices or software systems, helping to lower the cost and complexity of supporting proprietary solutions. Customers who use standards-based technology are not locked into any given vendors proprietary implementations. Microsoft supports the IETF efforts to standardize VPN technology. To date, two major technologies are IETF standardsLayer both Tunneling Protocol (L2TP)a combination of PPTP and Ciscos Layer 2 Forwarding, which evolved through the IETF standards process.Inte rnet Protocol Security (IPSec)an architecture, protocol, and related Internet Key deputise (IKE) protocol, which are described by IETF RFCs 2401-2409.The combination of these technologies is described in RFC 3193, an IETF Proposed Standard.In addition to IETF standards-track technologies, Microsoft supports PPTP, created by the PPTP Industry Forum (US Robotics now 3Com, 3Com/Primary Access, Ascend, Microsoft, and ECI Telematics.) PPTP is a published informational RFC (RFC 2637) and has some companies shipping third-party implementations.For advanced security requirements, IPSec has emerged as a key technology. However, IPSec tunnel mode by itself does support legacy authentication methods, tunnel IP talk assignment and configuration, and multiple protocolsall critical requirements for remote access VPN connections. To provide a truly interoperable solution, Windows Server 2003 uses L2TP in combination with IPSec to provide an interoperable, limit VPN solution. L2TP has broad ven dor support, particularly among the largest network access equipment providers, and has verified interoperability in a series of vendor-sponsored testing events.