| CHAPTER | |
| 16 | Virtual Private Networks |
How can you connect two networks in geographically separate locations without installing a private connection between them? How can you provide remote services to allow users to access corporate services that need to remain protected from the prying eyes of the public Internet? The answer to both questions is to use a virtual private network (VPN). VPNs provide virtual network links based on encrypting and isolating traffic at the packet level while using commodity Internet services for transport. The two most common uses of VPN are to link branch offices or remote sites together (called LAN-to-LAN tunneling, or L2L) and to provide remote access to office environments (called remote access [RA] ...
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