fwknop ☆
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Description:
Single Packet Authorization and Port Knocking
Type: Formula  |  Tracked Since: Dec 28, 2025
Links: Homepage  |  formulae.brew.sh
Category: Security
Tags: security networking firewall spa port-knocking
Install: brew install fwknop
About:
Fwknop implements Single Packet Authorization (SPA) and Port Knocking to provide a layer of stealth and security for network services. It allows networked resources to remain invisible to port scanners by only revealing open ports after receiving a valid, encrypted packet. This prevents reconnaissance and reduces the attack surface of protected systems.
Key Features:
  • Implements Single Packet Authorization (SPA) and Port Knocking
  • Uses encrypted packets to hide service access
  • Protects against reconnaissance and port scanning
  • Supports both iptables and firewalld integration
Use Cases:
  • Securing SSH access to servers without exposing the port to the internet
  • Protecting management interfaces and VPN endpoints
  • Implementing stealthy network access controls
Alternatives:
  • knockd – knockd is a classic port knocking daemon, while Fwknop provides the more advanced Single Packet Authorization feature which is more secure and reliable.
Version History
Detected Version Rev Change Commit
Sep 15, 2025 3:15am 1 VERSION_BUMP 6d4f0e8f
Dec 28, 2024 4:18pm 0 VERSION_BUMP 0c0ead31
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