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10 Introduction March 2004
Avaya SG203/SG208 Security Gateway Hardware Installation Guide
Figure 1 Typical SG203/SG208 security gateway installation
Functional overview
The SG203 and SG208 security gateways are dedicated hardware-based
network security devices designed to provide overlay security services on
an IP data network. The security gateway sits behind an edge router and
has auto-detecting ethernet interfaces on the public and private ports.
The security gateway’s primary function is to perform IPSec and firewall
security services to protect enterprise networks and to secure data being
sent over shared IP networks. The security gateway establishes an
Internet Key Exchange (IKE) protocol session with its IPSec peer to
perform an authentication and to negotiate the security associations
(SAs) that are used to secure the session. Once the successful