90CHAPTER 5: CONFIGURING THE ROUTER
Firewall | This section is for configuration settings of the Router’s firewall function. |
| Your Router is equipped with a firewall that will protect your network |
| from a wide array of common hacker attacks including Ping of Death |
| (PoD) and Denial of Service (DoS) attacks. You can turn the firewall |
| function off if needed. Turning off the firewall protection will not leave |
| your network completely vulnerable to hacker attacks, but 3Com |
| recommends that you leave the firewall enabled whenever possible. |
| SPI Stateful Packet Inspection (SPI) - The Intrusion Detection Feature of the |
| Router limits access for incoming traffic at the WAN port. |
| This feature is called a "stateful" packet inspection, because it examines |
| the contents of the packet to determine the state of the communications; |
| i.e., it ensures that the stated destination computer has previously |
| requested the current communication. This is a way of ensuring that all |
| communications are initiated by the recipient computer and are taking |
| place only with sources that are known and trusted from previous |
| interactions. In addition to being more rigorous in their inspection of |
| packets, stateful inspection firewalls also close off ports until connection |
| to the specific port is requested. |
| Figure 68 Firewall Screen |
