Packet Filter

Definitions

1. A filtering mechanism that makes allow-or-deny decisions based on packet-level properties such as source, destination, protocol, and port rather than full application context. Packet filters are efficient and foundational, but they provide less nuance than deeper stateful or application-aware inspection.

   In plain English: A filter that blocks or allows network traffic based on basic packet details.

   Example: "The router's packet filter blocked inbound traffic to the management port but could not detect malicious content in allowed sessions."

Related Terms

• OPNsense
• Anti-Spam
• Content Filtering
• Endpoint Firewall
• Firewall Log
• Firewall Policy
• Host Firewall
• IP Block
• Mail Gateway
• NAT Security
• Port 443
• Port Forwarding
• Private Network
• Public Network
• Reverse DNS