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Chapter 3: Introducing the VPN Gateway
The Avaya VPN Gateway (AVG) software includes two major functionality groups:
• SSL Acceleration
• VPN
These features can be used separately or be combined. The Avaya VPN Gateway User Guide covers the
basic tasks that need to be completed irrespective of which feature you wish to deploy.
SSL Acceleration
The VPN Gateway can function as a peripheral Secure Sockets Layer (SSL) offload platform
that attaches to an Application Switch or a comparable switch from another vendor. (The VPN
Gateway can also operate in standalone mode without being connected to a switch.)
The VPN Gateway performs a TCP three-way handshake with the client through the
Application Switch and performs all the SSL encryption and decryption for the session.
Combined with the load balancing features of the Application Switch, the VPN Gateway
offloads SSL encryption/decryption functions from back-end servers.
For examples on how to configure the VPN Gateway for SSL Acceleration, see the Avaya
Application Guide for SSL Acceleration.
For more information about the basic operations of the VPN Gateway, see the "Public Key
Infrastructure and SSL" chapter in the Avaya Application Guide for SSL Acceleration.
VPN
The VPN feature supports remote access to intranet or extranet resources (applications, mail,
files, intranet web pages) through a secure connection. What information should be accessible
to the remote user after login is determined by access rules (ACLs).
The intranet's resources can be accessed in clientless mode, transparent mode or both:
• From any computer connected to the Internet (clientless mode). The remote user
connects to the VPN Gateway through a secure SSL connection through the web browser.
When successfully authenticated, the user can access services and resources on the
intranet from a Web Portal provided by the VPN Gateway. Clientless mode also enables
User Guide
April 2013
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