Best Firewall Software44Firewalls are designed to block unauthorized access to and from networks, but chiefly to stop Internet users from accessing private networks.Cisco Firepower 2100 Series1https://media.trustradius.com/vendor-logos/KP/BJ/EKH5RFTLCO4X-180x180.PNGCisco Firepower 4100 Series2https://media.trustradius.com/vendor-logos/KP/BJ/EKH5RFTLCO4X-180x180.PNGCisco Firepower 9300 Series3https://media.trustradius.com/vendor-logos/KP/BJ/EKH5RFTLCO4X-180x180.PNGCheck Point 21000 Appliances4https://media.trustradius.com/vendor-logos/Tb/vB/CDDG6MZOH6BI-180x180.JPEGFortinet on IBM Cloud5https://media.trustradius.com/product-logos/BH/DH/7QMCZ3D8TTGW-180x180.JPEGCheck Point 13000 Appliances6https://media.trustradius.com/vendor-logos/Tb/vB/CDDG6MZOH6BI-180x180.JPEGCheck Point 12000 Appliances7https://media.trustradius.com/vendor-logos/Tb/vB/CDDG6MZOH6BI-180x180.JPEGCheck Point VPN-18https://media.trustradius.com/vendor-logos/Tb/vB/CDDG6MZOH6BI-180x180.JPEGCheck Point 41000 Security Systems9https://media.trustradius.com/vendor-logos/Tb/vB/CDDG6MZOH6BI-180x180.JPEG

Best Firewall Software

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Firewall Software Overview

What are Firewall Software?

Firewalls are filters that stand between a computer or computer network and the Internet. Each firewall can be programmed to keep specific traffic in or out. All messages passing through the firewall are examined and those not meeting pre-defined security criteria are blocked.


For example, on the outbound side, firewalls can be configured to prevent employees from transmitting sensitive data outside the network, while on the inbound side, firewalls can be configured to prevent access to certain kinds of websites like social media sites.

Firewall Software Features & Capabilities

  • Application visibility and control

  • Identify and control evasive app threats

  • Intrusion Prevention integration

  • Physical and virtual environment support

  • Integration with LDAP and Active Directory

  • "Sandbox," or isolated, cloud-based threat emulation

Firewall vendors are beginning to bundle firewall offerings with other security or privacy features, although this is not a universal practice. The most common example is support for Virtual Private Networks (VPN), and load-management is often featured as well.

Firewall methods

Firewalls use several methods to control traffic flowing in and out of a network:


  • Packet filtering: This method analyzes small pieces of data against a set of filters. Those that meet the filter criteria are allowed to pass through, while others are discarded.

  • Proxy service: In this method, computers make a connection to the proxy which then initiates a new network connection based on the content of the request. In this way, there is no direct connection or packet transfer on either side of the firewall. Network addresses are effectively hidden.

  • Stateful inspection: Stateful inspection is the new standard firewall security method that monitors communications packets over a period of time. Outgoing packets that request specific types of incoming packets are tracked. Only incoming packets that are an appropriate response are allowed to pass. Firewalls using this method are often referred to as next-generation firewalls (NGFW).

Pricing Information

The cost of firewalls can vary from free (for personal use) to significant sums of money for enterprise firewalls. Firewalls are often on-premise appliances, but can also be purchased as software which must be installed on a server, or as a cloud service. The range of pricing models is broad making it difficult to compare across vendors. However, an enterprise firewall may cost upwards of $30,000, depending on capability and type.

Firewall Products

Listings (51-59 of 59)

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Cisco offers the Firepower 2100 Series NGFW, designed to allow businesses to gain resiliency through superior security with sustained performance. The Firepower 2100 Series has a dual multicore CPU architecture that optimizes firewall, cryptographic, and threat inspection functions simultaneously...

We don't have enough ratings and reviews to provide an overall score.

The Cisco Firepower 4100 Series’ 1-rack-unit size is presented by the vendodr as ideal at the Internet edge and in high-performance environments. They further state that it shows what’s happening on your network, detects attacks earlier so you can act faster, and reduces management complexity.

We don't have enough ratings and reviews to provide an overall score.

The Cisco Firepower 9300 series is presented by the vendor as a carrier-grade next-generation firewall (NGFW) ideal for data centers and high-performance settings that require low latency and high throughput. With it, the vendor providdes, users can deliver scalable, consistent security to worklo...

Frequently Asked Questions


What is a firewall?

A firewall is a filter that stands between a computer or computer network and the Internet. It monitors incoming and outgoing network traffic and decides whether to allow or block specific traffic based on a defined set of rules. All messages passing through the firewall are examined and those not meeting pre-defined security criteria are blocked.

What are the main types of firewall?

There are four major types.

  • Packet Filtering: Small pieces of data are analyzed against a set of filters and are either allowed to pass through or are discarded.
  • Proxy Firewall: A proxy firewall serves as the gateway from one network to another. Computers make a connection to the proxy which then initiates a new network connection based on the content of the request.
  • Stateful Inspection: Stateful inspection monitors the state of active connections and uses this information to determine which network packets to allow through. Decisions on what to allow through are based on a combination of defined rules and context.
  • Next-Generation Firewall (NGFW): Next-generation firewalls go beyond packet filtering and stateful inspection. They have additional capabilities in order to help combat more modern threats like malware.

What’s the difference between a hardware and a software firewall?

Firewall hardware and firewall software both perform the same task; they both act as barriers between the internet and the computer and they both help to protect from anything that can harm the computer from an outside connection. Hardware firewalls offer network-wide protection from external threats. Software firewalls installed on individual computers are capable of closer data inspection and can block specific programs from sending data to the Internet.

What additional capabilities do next-generation firewalls have?

Next-generation firewalls are an acknowledgement that standard firewall capabilities are insufficient, and they typically include other related technologies such as: intrusion protection systems, deep packet inspection, SSL-encrypted traffic termination, and sandboxing.

How much do firewalls cost?

The cost of firewalls can vary from free (for personal use) to significant sums of money for enterprise firewalls. The range of pricing models is broad making it difficult to compare across vendors. However, an enterprise firewall may cost upwards of $30,000, depending on capability and type.