Avaya Configuring and Troubleshooting Bay Dial VPN (DVS) Networks Manual de usuario Pagina 21

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303509-A Rev 00 1-1
Chapter 1
Tunneling Overview
Bay Networks Dial Virtual Private Network Services provides secure dial-access
services for corporate telecommuters, mobile professionals, and users in remote
branch offices. Dial VPN provides switched connectivity to virtual private
networks (VPNs), based on Internet Engineering Task Force (IETF)
specifications. Corporate customers can subscribe to this service for remote dial
access to virtual private networks or to the Internet over telephone lines.
Bay Dial VPN Overview
Dial VPN offers remote users simple and secure access to virtual private networks
and the Internet through a mechanism known as a tunnel. A tunnel is a secure,
virtual, direct path between two end points. The process of encapsulating,
sending, and decapsulating the datagram is called tunneling, and the encapsulator
and decapsulator are considered the end points of the tunnel. Dial VPN
dynamically establishes and removes tunnels as needed. Dial VPN supports both
Layer 3 and Layer 2 tunneling (referring to the ISO model) on the same Internet
Service Provider (ISP) network.
Dial VPN lets ISPs offer a remote access outsourcing service to their enterprise
customers. Multiple enterprise customers share the same resources in the service
providers network or Internet. Because a given user’s data is tunneled, it is
inherently secured from the ISP’s other customers, similar to PVCs in a frame
relay network. Each enterprise customer is responsible for authenticating
individual dial-in users and assigning network addresses.
Using Dial VPN, an ISP’s enterprise customers can dial in to a local ISP
point-of-presence (POP) rather than potentially making a long distance call to a
Remote Access Concentrator located at the home network. Dial VPN can also
eliminate costs associated with maintaining the remote access equipment.
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