Packet filtering is a networking and security concept that focuses on controlling how traffic flows between devices, applications and external services. It helps separate trusted systems from untrusted environments such as the public internet.
When designed properly, packet filtering reduces exposure, makes malicious activity easier to spot and supports a layered defence strategy for both on‑premises and cloud‑based architectures.
Packet filtering shapes how traffic is allowed, inspected or blocked between different network segments. It helps enforce boundaries so that a compromise in one area is less likely to spread everywhere.
Packet filtering is particularly valuable in environments with internet‑facing systems, remote workers or cloud‑hosted workloads. It gives defenders more control and visibility over how connections are made.
Good practice includes using least‑privilege rules, reviewing configurations regularly and monitoring for unusual patterns. Changes to packet filtering should be tracked and tested so they do not introduce new risks.
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