Avaya Configuring and Troubleshooting Bay Dial VPN (DVS) Networks Manual de usuario Pagina 66

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Configuring and Troubleshooting Bay Dial VPN Services
3-18 303509-A Rev 00
The data packet travels from the home network to the remote node using a similar
process of encapsulation and decapsulation to respond to the format required at
various points throughout the Dial VPN network. The differences are:
The data packet must return from the CPE router on the home network to the
gateway on the Dial VPN network via a static route. Figure 3-6
shows the
static routes used to return data from a home network to a gateway on the Dial
VPN network.
If the CPE router is a Bay Networks (or similar) router, a nonexistent,
“dummy” adjacent host must be configured on the same IP subnet as the
frame relay interface of the CPE router. This fulfills an addressing format
requirement, but has no effect on the actual packet routing.
The gateway sends the GRE packet to the remote nodes care-of address on
the NAS, and the NAS forwards the packet to the remote node.
Figure 3-6. Static Routes from a CPE Router to a Dial VPN Gateway
Data packets move back and forth between the remote node and the home network
through the established tunnel until the remote node disconnects from the Dial
VPN network or an error occurs. When either situation occurs, Dial VPN tears
down the tunnel.
Tunnel
RAC
Gateway
BayDVS service
provider's network
DLCI = 101
DVS0007A
Frame relay
PVC
Dial-up
user
CPE
RADIUS
server
3.1.1.0
Home/
corporate LAN
1.1.1.2
Adjacent host/
next hop
3.1.1.X
1.1.1.1
Static route
Static route
RADIUS
client
2.2.2.1
Frame relay
port on gateway
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