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Firewall Technology: Web Resources and Links

Resources on firewalls — concepts and types, guidance, open-source firewalls and vendor directories.

37 topics•4 categories•Updated October 2026

Concepts & Types

14 entries

How firewalls work and the kinds there are.

01Firewall (Wikipedia)Overview of firewalls. 02What is a Firewall? (Check Point)Check Point explainer on types. 03Types of Firewall Architectures (Compuquip)Firewall types and architectures. 04What is a Firewall? (Palo Alto Networks)Cyberpedia entry. 05What is a Firewall? (Fortinet)Fortinet glossary entry. 06What is a Firewall? (Cloudflare)Cloudflare learning centre. 07What is a Firewall? (Cisco)Cisco explainer. 08Network Firewalls (Barracuda)Barracuda glossary entry. 09Firewall Protection: Types and BenefitsOverview of types and benefits. 10Introduction of Firewall in Computer Network (GeeksforGeeks)Tutorial. 11Types of Firewall and Possible Attacks (GeeksforGeeks)Tutorial. 12Firewall Security (Tutorialspoint)Tutorial. 13Network Security: Firewalls (Tutorialspoint)Tutorial. 14Understanding Firewall Types (Medium)Medium article.

Hardware, Software & Management

7 entries

Choosing and running firewalls.

15Hardware Firewall: An Overview (MilesWeb)Hardware firewall overview. 16What is a Hardware Firewall? (Liquid Web)Benefits of hardware firewalls. 17Next-generation firewall (Forcepoint)Forcepoint NGFW (the old explainer page now redirects here). 18AWS Firewall ManagerCentral firewall rule management on AWS. 19ManageEngine Firewall ManagementFirewall analyzer and rule management. 20Best Firewall Software (G2)User reviews. 21Top Cybersecurity Software ToolsRoundup of tools.

Guidance & Open-Source Firewalls

7 entries

Standards and free options.

22NIST SP 800-41 Rev. 1: Guidelines on Firewalls and Firewall PolicyNIST guidance on firewall selection and policy. 23pfSenseOpen-source firewall and router platform. 24OPNsenseOpen-source firewall and routing platform. 25Netfilter (iptables / nftables)Packet filtering framework in the Linux kernel. 26OpenBSD PFThe PF packet filter. 27Windows FirewallMicrosoft documentation. 28Uncomplicated Firewall (UFW)Ubuntu's simple firewall front end.

Related Pages

9 entries

Neighbouring pages on this site.

29Firewall ProvidersFirewall vendors. 30Personal Firewall VendorsPersonal firewall products. 31Web Application FirewallsWAF products. 32Network Security MicrosegmentationMicrosegmentation vendors. 33Secure Web GatewaysSecure web gateway vendors. 34Anti-Virus ResourcesAntivirus resources. 35Information SecurityOverview of information security. 36IT SecurityIT security hub. 37NetworkingNetworking hub: security, WAN, operations, cloud and wireless.

Frequently Asked Questions

What is a firewall?

A network security control that allows or blocks traffic according to rules, at the packet, connection or application level.

What types of firewall are there?

Packet filters, stateful inspection, application proxies and next-generation firewalls (NGFW), delivered as hardware, software, virtual or cloud services.

How do I choose?

Match throughput, inspection depth, management and cloud needs; NIST SP 800-41 gives selection and policy guidance, and pfSense or OPNsense are strong open-source options.

What replaced the older entries?

Dead or outdated links were removed, redirects updated, and standards and current tools added.

How current is this list?

Links were checked in October 2026. Sites that block automated checks are kept and may need a manual click.