
Configuring and Troubleshooting Bay Dial VPN Services
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Figure 1-2. Dial VPN Network with Connections to Different Destination Types
Figure 1-2 shows a Dial VPN service provider network with a Layer 3 tunnel. The
gateway provides connection services both to a corporate LAN and to a
third-party ISP network. This figure shows only one tunnel, but in reality Dial
VPN creates one tunnel for each dial-in connection.
In this illustration, a user at a remote node can dial in to a corporate or home
network or a third-party ISP by calling a local phone number associated with that
destination network. The network access server handles the call. The service
provider’s network uses a standard IP connection between the network access
server, shown here as a 5399 module in a 5000 MSX chassis, and the gateway. A
PPP connection or a frame relay PVC and a static route must exist between the
gateway and the customer premise equipment (CPE) router to provide a path for
packets to return to the remote node.
Tunnel
CPE
Network
access
server (NAS
Gateway
PPP
connection
Service
provider network
DVS0012A
Remote
node
TMS /erpcd
server
Frame relay
or PPP
PSTN
CPE
CPE
LAN
Third-party
Internet
service
provider
network
Internet
Customer
RADIUS
server
Third-party
ISP
RADIUS
server
Tunnel
domain
data
User
data
Customer
network
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