
Configuring and Troubleshooting Bay Dial VPN Services
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server, which sends back an acknowledgment that it has received the packet. At
the end of service delivery, the client sends the RADIUS server a Stop packet
describing the type of service that was delivered. The server sends back an
acknowledgment that it has received the packet.
The client sends a start or stop packet over the network, persisting until it receives
an acknowledgment or times out. The client can also forward the requests to an
alternate server or servers if the primary server is down or unreachable. The
RADIUS server may request other servers to satisfy the request. In this case, it
acts as a client.
If the RADIUS server cannot successfully record the start or stop packet, it does
not send an acknowledgment to the client.
Starting the Connection
When a user at a remote node dials in to a Dial VPN service provider, the NAS
first determines whether this is a tunnel candidate. If so, the NAS first accesses the
TMS database and contacts the gateway, which starts the authentication process.
The gateway gets an IP address from the RADIUS server on the user’s home
network, and the Remote Access Concentrator builds a tunnel to the gateway and
starts sending the GRE-encapsulated packets. The process involves the following
steps.
1.
A user at a remote node dials the phone number of a Dial VPN service
provider. The user also enters the required user information.
User information usually consists of a user name and a password.
2.
The remote node sends a PPP packet to start the connection process.
3.
The NAS receives the data packet and passes the user name to the TMS
on the Dial VPN service provider’s network to determine how to process
the packet.
For Dial VPN, the user name must contain one “at” sign (@), followed by at
least one period (.) and at least a 3-character extension. For example, the user
uses for authentication. The string @abc.com is the domain name that Dial
VPN uses to look up this user’s entry in the TMS database.
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