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In this project

https://sudonull.com/szi-firewall-ids-ips-dlp-siem

Breakdown of information protection means for IB specialists: types of firewall, principles of IDS/IPS, DLP methods. Practical scenarios and deployment. Study the SZI stack for your network.

LLM Security: Evolution from Firewall to GAF | In-Depth Analysis

https://sudonull.com/llm-security-evolution-from-firewall-to-gaf-in-depth-analysis

How modern threats to LLM require multi-level protection. We analyze incidents of 2025-2026 and the transition to Generative Application Firewall. Learn how to protect AI systems.

nftables guide: setting up firewall in Debian

https://sudonull.com/nftables-guide-setting-up-firewall-in-debian

Learn to configure nftables for server protection and network segmentation. Practical rule examples, threat models, testbeds. For sysadmin middle/senior — deploy in 30 min.

Little Snitch Linux: eBPF firewall

https://sudonull.com/little-snitch-linux-ebpf-firewall

Learn about the Linux version of Little Snitch: eBPF application traffic monitoring, blocking by IP/domains, web interface. Installation and comparison with OpenSnitch for developers.

Little Snitch Linux: eBPF traffic monitoring

https://sudonull.com/little-snitch-linux-ebpf-traffic-monitoring

Breakdown of Little Snitch for Linux: eBPF firewall with process-aware blocking, web interface and blocklists. Learn the architecture, trade-offs and production setup. Ideal for DevOps and security.

From the web

What Is a Firewall? Definition and Types of Firewall | Fortinet

https://www.fortinet.com/resources/cyberglossary/firewall

3 hours ago · Learn what a firewall is, how it works, and why it is important for network security. Explore the different types of firewalls, such as NAT, VPN, and NGFW, and their features and benefits.

Firewall (computing) - Wikipedia

https://en.wikipedia.org/wiki/Firewall_(computing)

Learn about firewalls, network security systems that monitor and control network traffic based on configurable rules. Explore the history, types, and functions of firewalls, from packet filter to next-generation firewall.

What Is a Firewall? - Cisco

https://www.cisco.com/site/us/en/learn/topics/security/what-is-a-firewall.html

A firewall is a network security device that separates a trusted internal network from an external network deemed untrustworthy, such as the internet. It regulates incoming and outgoing network traffic based on preset security rules.

What is a Firewall? | Microsoft Support

https://support.microsoft.com/en-us/windows/security/firewall/what-is-a-firewall

Data flows into and out of devices through what we call ports. A firewall is what controls what is - and more importantly isn't - allowed to pass through those ports. You can think of it like a security guard standing at the door, checking the ID of everything that tries to enter or exit.

Firewall and network protection in the Windows Security app

https://support.microsoft.com/en-us/windows/security/windows-security/firewall-and-network-protection-in-the-windows-security-app

You can use the Windows Security app to view and manage the status of Windows Firewall . You can turn the firewall on or off, and access advanced settings for different network types, including domain (workplace), private (trusted), and public (untrusted) networks.

Introduction of Firewall in Computer Network - GeeksforGeeks

https://www.geeksforgeeks.org/computer-networks/introduction-of-firewall-in-computer-network/

Apr 28, 2026 · A firewall inspects all incoming and outgoing traffic and decide whether to allow or block it. All data packets entering or leaving the network must first pass through the firewall .

What is a firewall? What do firewalls do and why do you need one?

https://www.malwarebytes.com/cybersecurity/basics/firewall

A firewall is a security system that monitors and controls network traffic based on predetermined rules. Learn about different types of firewalls, their roles, and how they protect your devices from online threats.