INDEX   TOC
Introduction
Product Overview
Settings and Administration
  Installation
  Configuration
  LAN Overview
  Administrate Users
  Upgrade Firmware
ADSL
SIP Support
Security
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.