INDEX   TOC
Introduction
Product Overview
Settings and Administration
ADSL
SIP Support
Security
  Broadband Security
  Firewall Overview
  The Firewall in
  VPN Pass Through
  Security Log
  Smart Card Reader
Firewall Administration
Troubleshooting

Stateful Inspection

A newer method that doesn't examine the contents of each packet but instead compares certain key parts of the packet to a database of trusted information. Information travelling from inside the firewall to the outside is monitored for specific defining characteristics, then incoming information is compared to these characteristics. If the comparison yields a reasonable match, the information is allowed through. Otherwise it is discarded.