INDEX   TOC
Introduction
Product Overview
Settings and Administration
ADSL
SIP Support
Security
Firewall Administration
Troubleshooting
  Overview
  System Log
  FAQ
  Compatibility
  Diagnostic Test
  Remote Configuration
  Smart Card Reader

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.