Bay Networks Baystream 7 Configuration And Troubleshooting Manual page 178

Configuring and Troubleshooting Bay Dial VPN Services
TMS database
tunnel
Tunnel Management
System (TMS)
Virtual Private
Network (VPN)
Glossary-6
The TMS database (by default, UNIX ndbm) resides in the tunnel
management server. The main function of this database is to verify the
username (or domain) information supplied by the NAS, and to supply the
NAS with the tunnel addressing information (in the Grant message) it needs to
create a tunnel for a remote user. The Dial VPN administrator "provisions" the
database by entering the username/domain information and the tunnel
addressing information into the database when configuring TMS.
A bidirectional IP path that exists between the Remote Annex and a Dial VPN
gateway. The tunnel can carry arbitrary network layer protocols in GRE
format within IP packets. The tunnel remains active until the remote node
disconnects from the Dial VPN network or an error occurs.
A database of IP tunnel management information that resides on a server on
the Dial VPN network. This server provides information to the NAS to
authenticate users (via the RADIUS client on the Dial VPN gateway) and to
construct IP tunnels, based on user dial-in information from the remote node
and information stored in the TMS database.
A public wide area network (WAN) composed of many small local area
networks (LANs). Corporations can subscribe to a VPN to interconnect their
private LANs into a "virtual" private WAN. VPNs provide a business or
organization with all the functions and security of private, leased-line service,
but at costs based on usage instead of the fixed, leased rates for private lines.
Corporations still purchase a leased line but at a much cheaper price because it
connects the corporate site only to the local service provider point-of-presence
(PoP).
With virtual private networks, a long-distance service provider, such as a
telephone company, uses its own network resources and software to establish,
operate, and maintain the entire "virtual" private network on behalf of the
organization.
BayStream Multiservice Software Version 7.2 115623B Rev. 00