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Additional resources for Building a Virtual Private Network
As shown in Figure 2-1, VIPR works by logically partitioning a physical router located at the service provider end (as a part of the ISP's infrastructure). Each partition is configured and managed as a physical router and can support an individual VPN. In simpler terms, each logical partition is treated as a complete router with full router functionality. As a result, these logical router partitions can support multiple protocols and are capable of handling private IP addresses. Figure 2-1: A generic representation of VIPR.
Novell's IP Gateway for NetWare is one such example. It converts Chapter 2: VPN Requirements, Building Blocks, and Architectures 45 46 Chapter 2: VPN Requirements, Building Blocks, and Architectures IPX traffic to IP and vice versa. Note IPX, or Internetwork Packet eXchange, is a proprietary Novell LAN protocol. • Use of Tunneling. Tunneling, as you learned in the previous chapter, is the technique of encapsulating non-IP data packets into IP packets for transmission across IP-based infrastructure.
Chapter 2: VPN Requirements, Building Blocks, and Architectures You learned in the previous chapter that a VPN is a secure and relatively simple method of establishing intranet connectivity across public networks. VPN technology not only reduces the cost of implementing a highly secure network environment, but also reduces management and staffing costs. In addition, it offers high availability, scalability, and effective use of network bandwidth. What goes into the making of a VPN-based solution?