Definition: A packet filter is a type of firewall. Packet filters can restrict network traffic and protect your network by rejecting packets from unauthorized hosts, using unauthorized ports or trying to connect to unauthorized IP addresses.
Packet Filter
From Tony Bradley, CISSP-ISSAP, former About.com Guide
Explore Internet / Network Security
Must Reads
About.com Special Features
The Best Web Trends of the Decade
A look back at the best innovations, ideas and technologies over the last 10 years, More >
Family Tech Center
Stay connected and entertained with reviews on tips on the latest HDTVs, cellphones and more. More >
©2009 About.com, a part of The New York Times Company.
All rights reserved.