Bay Networks Baystream 7 Manual de usuario descargar pdf (Pagina 11)

Concentric Network Corporation White Paper, Outsourcing Remote Access Services

10/1/1998 11

IP Network

GRE Encapsulated Tunnel

Gateway

Router

RAS

PPP session

Frame Relay link

Layer 2 PPTP/L2TP tunneling in a

Layer 3 (Virtual Tunneling Protocol) session

Router

NT Server

Laptop

computer

Layer 2 tunneling is a session between the client

and a NT server located on the corporate network

Tunnel Registration and User Authentication

Two critical components of the Concentric RemoteLink™ service are the Tunnel Management

Server (TMS) and the Authentication Server (AS) processes.

The TMS is used to store relevant information about the customer’s network including the

customer’s two IP tunnel endpoints and characteristics associated with the tunnel such as tunnel

refresh timers, type of encryption used, and the customer’s IP domain name.

The AS is used to authenticate individual users attempting to gain access to the customer’s

“home” network.

Summary & Future Directions

Today there are no vendors today currently implementing standards-based tunneling. PPTP has

been retired in favor of L2TP. L2F has been retired for the same reason. Concentric is closely

monitoring the activities surrounding L2TP. As L2TP becomes closer to standardization,

Concentric will support this alternative tunneling scheme. Supporting both Layer 3 Forwarding

and Layer 2 Forwarding will give our customers the option of choosing a VPN architecture that

most closely fits the requirements of the service being offered. In either case, the service can be

deployed using the technology infrastructure currently in Concentric’s network.

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Bay Networks Baystream 7 Manual de usuario Pagina 11