Avaya Configuring and Troubleshooting Bay Dial VPN (DVS) Networks Manuel d'utilisateur Page 29

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Tunneling Overview
303509-A Rev 00 1-9
Gateway
Used only in Layer 3 networks, the gateway can be an ASN, BLN, BLN-2, BCN,
or System 5000 MSX equipped with a Model 5380 module running BayRS
software.
The gateway connects the Dial VPN service provider’s network and the CPE
router on the remote user’s home network. The gateway performs conventional IP
routing functions configured on interfaces connected to the IP network, through
which the network access servers can be reached.
The gateway is the end point of the IP-routed tunnels that transport packets
originated by remote nodes and encapsulated by the NAS. The gateway also
connects to the CPE router on the user’s home network. The gateway is the data
terminal equipment (DTE) for frame relay PVCs or PPP connections connecting
to multivendor RFC 1490-compliant routers on the customer premises.
For a frame relay network, the connection is through a frame relay user network
interface (UNI). The gateway forwards traffic between a remote node and the
corresponding node in its home network by forwarding packets over a frame relay
PVC connecting the UNI to the IP tunnel. Thus, the gateway uses the IP tunnel
and the frame relay PVC as two links through which it can send the user traffic
from one side to the other.
The PPP connection between the gateway and the customer’s home network
functions in a similar way, except that the connection is through a PPP interface
instead of a frame relay interface.
In Layer 3 tunneling, the gateway may also act as a RADIUS client to authenticate
the remote user based on information provided from the NAS. The RADIUS
client on the gateway sends an authentication request to the RADIUS server on the
home network, which either grants or denies the request in a message to the
gateway. The gateway then returns this information to the NAS to continue the
process.
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