Avaya Configuring and Troubleshooting Bay Dial VPN (DVS) Networks Instrukcja Użytkownika Strona 35

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302272-A Rev. 00 2-1
Chapter 2
Dial VPN Layer 2 Tunneling
This chapter describes how a Layer2 Dial VPN tunnel functions. Among these
concepts are how a data packet sent from a remote node using PPP moves through
a Dial VPN service provider’s 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 encapsulation technologies and the Layer 2 Tunneling Protocol
(L2TP) to provide a secure pathway for remote users to exchange data with their
corporate home network. Regardless of where a remote node is located, it can dial
in to its Dial VPN service provider and connect to the home network.
Figure 2-1
shows the path of a packet in a Layer 2 tunnel. The NAS functions as
an L2TP access concentrator (LAC) and the other tunnel end point is the CPE
router or extranet switch on the customer’s home network. That router or switch is
the L2TP network server (LNS), which terminates all L2TP tunnels and sessions
with that 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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