March 2004 Introduction 9
Chapter 1 Introduction

Functional overview

The Avaya SG5, SG5X, and SG200 security gateways are VPN
gateways to virtual private networks (VPNs) for small business an d home
office users. The security gateway allows users to connect securely to
their corporate networks and intranets through always-on connections
such as DSL and cable modems. Designed to provide the convenie nce of
a firewall and a gateway all in one compact desktop enclosure, the
security gateway provides a cost-effective solution to quick and easy VPN
deployment while providing strong attack prevention mechanisms against
common attacks and Internet security threats.
The SG5X and the VSU200 are functionally identical to the SG5, but the
VSU5X includes an integrated 7-port Ethernet switch. The VSU200
introduces a cardbus/PCMCIA expansion slot for future functionality,
routing capabilities, and firewall enhancements that can be managed
from a central-site location.
Like other platforms in the Avaya VPN family, the security gateway adds
encryption, authentication, and key management to public network data
links to ensure privacy and integrity of corporate data, and to enable th e
efficient and secure operation of VPNs. It is designed to perform complex
operations, in real time, without compromising network performance.
The security gateway supports a full suite of VPN services including:
IPsec-based encryption, packet authentication, and IKE key
management, Network Address Translation (NAT), and packet filtering.