Gateway - Bay Networks Baystream 7 Configuration And Troubleshooting Manual

The NAS receives and processes calls from remote nodes and routes data to
remote nodes. The NAS can be any of the following:

Gateway

The gateway can be an ASN, BLN, BLN-2, BCN, or System 5000 MSX equipped
with a 5380 module running BayStream 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 remote access servers can be reached.
The gateway is the endpoint of the IP-routed tunnels that transport GRE
encapsulated packets originated by remote nodes and encapsulated by the NAS.
The gateway also connects to the frame relay network between the service
provider's network and the user's home network. The gateway is the data terminal
equipment (DTE) for frame relay PVCs connecting to multivendor RFC
1490-compliant routers on the customer premises, by way of a frame relay
network.
The connection to the frame relay network 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 between 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.
For Dial VPN, the gateway also acts 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.
115623B Rev. 00
• 5390 (Remote Annex 4000) -- Asynchronous interface
• 5391 (Remote Annex 6100) -- Single channelized T1 interface to the
PSTN; it can handle up to 24 incoming dial-up connections at 28.8 Kb/s
• 5393 (Remote Annex 6300) -- ISDN PRI interface, which can accept
mixed (synchronous and asynchronous) traffic
• 5399 (Remote Access Concentrator 8000) -- Dual WAN server, which can
support both analog calls and digital calls carried over ISDN
BayStream Multiservice Software Version 7.2
Planning for Dial VPN
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