Firewall

Firewall Configuration Essentials

HxHippy

27 Nov 2025 — 1 min read

Firewalls remain a fundamental component of network security. Proper configuration is critical for effective protection.

Types of Firewalls

Packet Filtering: Examines packets based on source/destination IP, ports, and protocols.

Stateful Inspection: Tracks connection state for context-aware decisions.

Application Layer (WAF): Inspects traffic at the application layer.

Next-Generation (NGFW): Combines features with intrusion prevention and application awareness.

Best Practices

Default Deny: Block all traffic by default, only allow what's needed
Least Privilege: Permit minimum required access
Document Everything: Record all rules and their purposes
Regular Audits: Review rules quarterly
Log and Monitor: Enable logging for denied traffic

Common Mistakes

Using "any" in rules without justification
Default passwords on appliances
Failing to segment internal networks
Not updating firmware

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