What are packet filters and how do they work?

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Packet filtering is often referred to as the process of checking data packets at the IP layer and selectively accepts or rejects them based on the IP addresses. This technique is often used in firewalls where the firewall may reject packets from specific source addresses. The firewalls work the other way also. Often a firewall will accept packets from specific locations (ranges of addresses) and reject others.

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This was first published in February 2002

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