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September 2010
Bimonthly
01

Office Networking Tips

Question:
What kinds of firewall inspection technologies are available in a broadband gateway products?

Answer:
There are two main types of firewall inspection technology: static packet inspection, or dynamic packet inspection. Static packet inspection works by checking the contents of each packet, and filtering them based on predefined rules. Unfortunately, this means that static packet inspection firewalls can be fooled by invalid packets pretending to be something they are not.

Stateful packet inspection, which is used in ZyXEL's firewall products, goes beyond administrator-defined packet filtering, and monitors the state of active connections as well. This means that firewalls will check whether a packet is the start of a new connection, a part of an existing connection, or is an invalid packet. The result: stateful packet inspection provides more secure, more intelligent filtering decisions.

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