Firewall Software & Tools

Firewalls (perimeter security) are clearly 101 Cybersecurity. There are a ton of options out there; here are a few recommended solutions for 2020.

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Posted by Henry Dalziel  |  December 16, 2019  |   Questions / Comments 2

Firewall Software & Tools

Recommended Tools  2
Henry Dalziel
Henry Dalziel | December 16, 2019

- C|EH, Security+, MSc Marketing Management;
- Based in Hong Kong for the last five years;
- Cybersecurity Pro & Growth Hacker


Firewalls as a technical term, when applied to Cybersecurity, is possibly one of the greatest ever ‘marketing coups’ with regards to its’ perception. The term ‘Firewall’ conjures up an instant image of protection and security but alas nothing could be further from the truth. Firewalls are only as good as the human being behind it. The IT Team (perhaps ‘Security Team’) that manages the Firewall(s) will need to set-up rules for ingress and egress traffic as well as ensuring that the ruleset is all configuring correctly.

The patching of Firewalls is also of vital importance so just simply stating that you ‘have a Firewall so I’m ok!’ is a misnomer.

In this resource, we list a bunch of Firewall solutions that we’d recommend. There are many (read: hundreds) of different Firewall solutions, vendors and strategies so tread carefully with this list.

The pricing of Firewalls and indeed all affiliated software connected therein (such as SOC Software) for example varies tremendously from it being Open Source to it being extremely expensive.

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2 Recommended Tools

Firewall Software & Tools


Packet Filter is this hacking tool’s method for filtering TCP/ IP traffic and running Network Address Translation. PF is also capable of normalizing and conditioning TCP/IP traffic This tool also provides bandwidth control and packet prioritization. Packet Filtering has been a part of the ‘GENERIC OpenBSD kernel’ since OpenBSD 3.0. Previous kernel versions of OpenBSD shipped with a different firewall/ NAT that is no longer supported.

Is OpenBSD PF Free?
Yes, this product is absolutely free.

Does OpenBSD PF Work on all Operating Systems? Just like netfilter, OpenBSD only works for Linux operating systems.

What are the Typical Uses for OpenBSD PF? A lot of users love OpenBSD due to the fact that it handles networks address translation, gives you a bandwidth control, packet proritazation and can normalize TCP/IP traffic. Users of this tool will have access to features such as passive OS detection.


Netfilter is a classic Firewall hacking tool used by many within the cybersecurity industry. The tool (framework) essentially filters packets inside Linux 2.4.x and later kernels. Netfilter is a series of hooks inside the Linux kernel that allows kernel modules to perform callback functions within the network stack. A registered callback function is then called back for every packet that traverses the respective hook within the network stack. iptables is a generic table structure for the definition of rulesets. Each rule within an IP table consists of a number of classifiers (iptables matches) and one connected action (iptables target). netfilter, ip_tables, connection tracking (ip_conntrack, nf_conntrack) and the NAT subsystem together build the major parts of the framework.

Is Netfilter Free?

Does Netfilter Work on all Operating Systems?
It's only for Linux operating systems.

What are the Typical Uses for Netfilter?
Netfilter allows the user to filter packets, network addresses along with ports, translations (within the NA[P]T protocols) and other packet auditing.

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Firewall Software & Tools

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Previously Asked Questions (with Answers)

The three basic types of firewalls that help companies to protect their data & devices and keep destructive elements out of their networks are Packet Filtering, Stateful Inspecting, and Proxy Server Firewalls.

A firewall is a system that serves as prevention against unauthorized access to or from a private network. A firewall can be executed either hardware or software form, or a combination of both. It avoides and block unauthorized internet users from accessing private networks connected to the internet, especially intranets.

A firewall is basically referred as a wall intended to confine a fire or potential fire within a building. Later uses refer to similar structures, such as the metal sheet separating the engine compartment of a vehicle or aircraft from the passenger compartment.

A proxy firewall is a network security system that secure a network resources by filtering messages at the application layer. It is also called as an application firewall or gateway firewall.

Typically, firewalls are used to secure internal/private LAN from the Internet. It works at layer 3 and 4 of the OSI model. Layer 3 is the Network Layer where IP works and Layer 4 is the Transport Layer, where TCP and UDP function

Hardware firewalls work by examining the data that is found in the Internet and checking whether that information is safe. Simple firewalls, known as packet filters, examine the data itself for information such as its location and its source.

Hybrid Firewall effectively protect your servers and workstations from malicious probes and unauthorized access. Packet Filtering Firewall. Blocks or allows packets through the network depending on the source/destination IP, protocols and ports.

A firewall can defeat an attack if it discards all the packets that arrive at the incoming side of the firewall; as long as the source IP is equal to one of the internal IPs. Source Routing Attacks are different since the attacker specifies the route to be taken by the packet with a hope to fool the firewall.

A firewall can be classified either as hardware or software. A hardware firewall is a unit that is linked between the network and the device for connecting to the Internet. A software firewall is a program that is installed on the computer with the presence of the Internet connection.

Host-based firewalls usually cost around $100 or less. Enterprise firewalls can cost over $25,000. The most popular medium-range business firewalls cost from $1500 to around $5000; so, in other words, yes – the price totally varies.

McAfee firewall creates a wall between your computer and the internet. Further, McAfee firewall provides complete inbound and outbound firewall protection. It trusts known good programs and helps block spyware, trojans and key loggers

2 responses to “Firewall Software & Tools”

  1. Nayem says:

    Hi, I’m looking for a way to do a firewall hack and test my skills for free?

    • Henry Dalziel says:

      Good question and yes, there are lots. I’ll be writing a review this year of all the vulnerable platforms and virtual machines you can test your skills on.

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