Avaya Configuring and Troubleshooting Bay Dial VPN (DVS) Networks Instrukcja Użytkownika Strona 49

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302272-A Rev. 00 3-1
Chapter 3
Dial VPN Layer 3 Tunneling
This chapter describes how a Layer 3 Dial VPN tunnel functions. Among these
concepts are how a data packet sent from a remote node using the point-to-point
protocol (PPP) moves through a Dial VPN service providers network to a
corporate or “home” network via a frame relay or PPP connection. It also explains
how the Dial VPN tunnel forms a path to move data quickly and efficiently to and
from the remote node through the Dial VPN service provider’s IP backbone
network.
Dial VPN uses the Generic Routing Encapsulation (GRE) protocol and the Mobile
IP protocol to provide a secure pathway for remote users to exchange data with
their corporate home network over a Layer 3 tunnel. Regardless of where a remote
node is located, it can dial in to its Dial VPN service provider and connect to the
home network.
For example, Figure 3-1
shows how a packet moves in an erpcd-based network
from the NAS, through the Layer 3 tunnel to the gateway, across a frame relay
connection, and on to the home network. In this figure, the dotted line shows the
path of the packet through the tunnel; the Dial VPN service provider network is
the ISP network.
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