Avaya Configuring and Troubleshooting Bay Dial VPN (DVS) Networks Manual de usuario Pagina 23

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Tunneling Overview
303509-A Rev 00 1-3
Dial VPN dynamically creates a tunnel when it connects to the remote node’s
home network. One end point of the tunnel is the access concentrator. The other
end point is either the gateway router on the ISP’s network (for a Layer 3 tunnel)
or the L2TP network server (for a Layer 2 tunnel). Once the tunnel is created,
packets from the remote node and the corporate home network flow through the
tunnel. In a Layer 3 connection, each tunnel supports one user. The tunnel exists
as long as the user remains connected. In a Layer 2 connection, each user is a
session. A tunnel is established only once between a LAC and an LNS.
After establishing a connection, the NAS receives a PPP packet (or payload) from
the remote node. The packet moves from the NAS, through the tunnel to the home
network.
Dial VPN supports both Layer 3 and Layer 2 tunnels on the same ISP network.
Figure 1-1
shows a Dial VPN network with both Layer 3 and Layer 2 (L2TP)
tunnels.
Figure 1-1. Dial VPN Network with Layer 3 and Layer 2 Tunnels
Layer 3 Tunnel
RAC
IP Network
WAN
(PPP or
Frame relay)
Remote
node
Remote
node
GW
Router
Customer Premise
Server
Authentication
Accounting
Authorization
IP Management
TMS
PPP
PPP
L2TP Tunnel
Router
Customer Premise
Server
Authentication
Accounting
Authorization
IP Management
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