OPNsense vs Zyxel Unified Security Gateway comparison

OPNsense and Zyxel are both solutions in the Firewalls category. Additionally, 95% of OPNsense users are willing to recommend the solution, compared to 50% of Zyxel users who would recommend it.

Comparison Buyer's Guide

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Executive Summary

We performed a comparison between OPNsense and Zyxel Unified Security Gateway based on real PeerSpot user reviews.

Find out in this report how the two Firewalls solutions compare in terms of features, pricing, service and support, easy of deployment, and ROI.

To learn more, read our detailed OPNsense vs. Zyxel Unified Security Gateway Report (Updated: December 2025).

Buyer's Guide

OPNsense vs. Zyxel Unified Security Gateway

December 2025

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Review summaries and opinions

We asked business professionals to review the solutions they use. Here are some excerpts of what they said:

Categories and Ranking

Fortinet FortiGate

Featured Reviews

Vasu Gala

Manager, Information Technology Operation/Presales at TechMonarch

A stable solution with an intuitive interface and quick customer service

I have been working with Fortinet FortiGate, WatchGuard, Sophos, and SonicWall. I'm not as comfortable with SonicWall because of their UI and limitations. I prefer Fortinet above all other options. When it comes to configuration, I am confident in my ability to handle various tasks, including creating policies such as firewall rules, web policies, and application policies. Additionally, I can configure VPNs and implement load balancing, among other tasks. Overall, I feel much more comfortable working with Fortinet. Fortinet has made significant improvements by integrating AI with firewalls for threat analysis and prevention. In the past 2-3 years, they have launched FortiSASE and SIEM, and they also provide SOC services. Both Palo Alto and Fortinet FortiGate are excellent. While Fortinet FortiGate comes at higher prices, the functionality and support justify the cost. They promptly resolve firmware issues and inform all support providers about configuration changes.

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Moutaz Sheikh Alard

ISO 27001 Lead Implementer at a consultancy with 11-50 employees

Has helped simulate enterprise security setups and strengthens network segmentation practices

For my capstone, I use OPNsense for my project and its broader benefits for enterprise and cybersecurity context. OPNsense is an open source based firewall and routing platform. It offers enterprise-grade features such as intrusion detection and prevention system, VPN support, traffic shaping, and web filtering, all without license cost. This platform has a modular design, a clean web-based GUI, and frequent updates that prioritize security and usability. It competes with commercial firewalls such as Cisco ASA, FortiGate, and Palo Alto, but stands out because it's community-driven, cost-effective, and transparent. I find OPNsense's feature of acting as a central firewall and gateway most valuable, providing robust point segmentation between the internal network and DMZs in my capstone project, intrusion detection to monitor malicious traffic, VPN services for secure remote access, and logging and monitoring for compliance and auditing. This allows me to simulate a real-world enterprise environment on a smaller scale, demonstrating both security hardening and network efficiency. OPNsense impacts my projects and home network positively because its cost-effectiveness is perfect for lab and enterprise setup without expensive licensing. The flexibility, easy VLAN and DMZ configuration supports different zones such as web servers, mail servers, and log servers. The security-first design for IDS/IPS integration helps me showcase modern defense-in-depth strategies. The user-friendly management through the web GUI makes it possible to manage complex firewall rules clearly, which is critical when documenting and presenting a capstone. Scalability is also an advantage. Although my project is lab-based, OPNsense can scale into production deployments in SMBs and enterprise.

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reviewer2399337

Sales and technical consultant at a manufacturing company with 10,001+ employees

User has benefited from stable performance and effective completion of security tasks

I use it mostly for VPN and for some firewall solutions When considering my main use case with VPN, I can say that I got the Zyxel Unified Security Gateway, and it works fine. However, we are thinking about using a different solution based on open source because Zyxel Unified Security Gateway…

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Quotes from Members

We asked business professionals to review the solutions they use. Here are some excerpts of what they said:

Pros

"Fortinet FortiGate has a very stable Linux-based operating system that is easy to use."

"The product is easy to install since we only need to follow the user manual, documents, and articles provided by Fortinet to install the product."

"Initial setup is easy to configure."

"Their proxy-based inspection is responsive and secure."

"The feature I like most is the SD-WAN. It allows you to manage more than one ISP at the same time. And there is a high-availability mode, so if one of your ISPs is down, you still have a backup."

"The price-to-performance ratio for using Fortinet FortiGate is always better compared to any other competitor, so they are rated better than the likes of Check Point or Palo Alto."

"It is quite easy to handle."

"The most valuable feature of Fortinet FortiGate is the simple configuration."

More Fortinet FortiGate pros

"We saved up to half a million Egyptian pounds, which is nearly $100,000 yearly on licensing or subscription using this kind of software, and the network attacks reduced by approximately 60% after using that, even without customizing the custom configuration yet."

"It's open source."

"The solution is user-friendly and easy to configure."

"I feel that its valuable features are that it is simple and free."

"It has firewall and VPN capabilities, which are very valuable features."

"OPNsense is easy to scale when running on the hardware."

"We can open a new VPN connection easily. It's much easier than with Fortinet in our experience."

"The tool's integration is more like a button press."

More OPNsense pros

"The Zyxel Unified Security Gateway solution is stable and does its job effectively."

"The most valuable features of the solution stem from web filtering, malware protection, and antivirus."

"This is a capable appliance and the standard features work well for us."

"The solution can scale well."

Cons

"There could be improvements in the mathematical algorithms used for behavior analytics of traffic."

"There is a need for enhancement with the signature management, improving the datasheet numbers, and scalability issues."

"Someone without certification and experience with other firewalls might find it a bit more challenging to grasp the FortiGate format and its platform layout."

"Fortinet should improve its software, as we are seeing lots of firmware versions generated for each vulnerability issue. It becomes difficult for us to keep updating the firmware frequently due to bugs."

"Integrating OpenVPN with FortiGate would provide a powerful combination of secure remote access and comprehensive network security."

"There is room for improvement in pricing."

"I would like to see improvements in the IPS/IDS feature to enhance protection against attacks from attackers, including ransomware protection."

"I use the FortiGate 60D model and realized the 300Mbps bandwidth limitation. Because it is a product that offers many services, I think it could have greater bandwidth capacity."

More Fortinet FortiGate cons

"The ability to set the VPN IP address would be a welcome addition."

"The logging could improve in OPNsense."

"The documentation should be clearer because I faced some difficulties navigating many options."

"OPNsense struggles to handle large volumes of voice traffic, indicating scalability issues in that specific use case."

"The solution would not be suitable for anything large-scale."

"The interface of the solution is an area with shortcomings."

"OPNsense could improve by making the configuration more web-based rather than shell or command-line-based."

"I think the most important thing is that it should be easily accessible, but currently, that doesn't seem to be the case. We need a hardware platform that's based on common standards and open computing principles, which would be like a commodity and benefit us greatly."

More OPNsense cons

"Sometimes it reboots when you least expect it, and that's the main issue."

"Although manageable, the user interface is a little bit slow and could be improved."

"The product has some scalability and data management issues where improvements are required."

Pricing and Cost Advice

"The license for Fortinet FortiGate is affordable in my country."

"It's expensive, but compared to the competition it's okay."

"As far as I'm aware, in our case, it's just a yearly pricing arrangement with no additional licensing costs."

"FortiGate SWG is a cost-effective solution well-suited for organisations of all sizes."

"No comment."

"If we have an older version, the support costs get quite high."

"I rate FortiGate Next Generation Firewall a five out of ten for pricing."

"The solution requires a license annually, it is not a user license, you can have as many users as your want. I must renew the license regularly per device."

More Fortinet FortiGate pricing and cost advice

"There are no licensing costs for OPNsence."

"Its pricing is unbeatable in comparison to other firewalls. You can have a small instance that could be €80 a month with the hardware underneath. Azure Firewall and FortiGate are out of the question at this price. If you are on a public cloud, you need the underlying infrastructure. Other than that, there is no additional cost. If you have it on-prem, you have to buy the server or the appliance. The hardware cost is replaced with the infrastructure cost in the cloud. You also have costs for the public IPs and underlying VMs, but that's not related to OPNsense. It would be the same for a FortiGate deployment on Azure. You need a FortiGate license, and you need the underlying infrastructure that scales up depending on your needs."

"We are using the paid version."

"It's not expensive."

"It costs about $1000."

"The price of OPNsense is good."

"As an appliance, it's in the medium price range."

"It is free."

More OPNsense pricing and cost advice

"The price of Zyxel Unified Security Gateway is good compared to other similar products in the market."

"This gateway is pretty cheap."

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Top Industries

By visitors reading reviews

Computer Software Company

12%

Comms Service Provider

Manufacturing Company

Financial Services Firm

Comms Service Provider

17%

Computer Software Company

11%

Manufacturing Company

University

Comms Service Provider

23%

Computer Software Company

11%

Outsourcing Company

Wholesaler/Distributor

Company Size

By reviewers

Large Enterprise

Midsize Enterprise

Small Business

By reviewers
Company Size	Count
Small Business	357
Midsize Enterprise	133
Large Enterprise	188

By reviewers
Company Size	Count
Small Business	30
Midsize Enterprise	5
Large Enterprise	8

No data available

Questions from the Community

Which is the better NGFW: Fortinet Fortigate or Cisco Firepower?

When you compare these firewalls you can identify them with different features, advantages, practices and usage a...

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What is the biggest difference between Sophos XG and FortiGate?

From my experience regarding both the Sophos and FortiGate firewalls, I personally would rather use FortiGate. I know...

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What are the biggest technical differences between Sophos UTM and Fortinet FortiGate?

As a solution, Sophos UTM offers a lot of functionality, it scales well, and the stability and performance are quite ...

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What is the difference between PfSense and OPNsense?

Two of the most common and well recognized firewalls, PfSense and OPNsense both support site-to-site IPsec VPN and cl...

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What do you like most about OPNsense?

What I like the most about OPNsense is that it offers an easy-to-use dashboard for device management and control.

See all answers

What is your experience regarding pricing and costs for OPNsense?

My experience with pricing, setup cost, and licensing is that since OPNsense is free, the licensing and setup was eas...

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What do you like most about Zyxel Unified Security Gateway?

The most valuable features of the solution stem from web filtering, malware protection, and antivirus.

See all answers

What is your experience regarding pricing and costs for Zyxel Unified Security Gateway?

I cannot definitively comment on whether Zyxel Unified Security Gateway is an affordable product as I haven't done co...

See all answers

What needs improvement with Zyxel Unified Security Gateway?

The integration capability is quite challenging. The system is very complicated, and many features are hidden. I'm lo...

See all answers

Comparisons

Sophos Firewall vs Fortinet FortiGate

Compared 20% of the time

Cisco Secure Firewall vs Fortinet FortiGate

Compared 13% of the time

Netgate pfSense vs Fortinet FortiGate

Compared 6% of the time

Palo Alto Networks NG Firewalls vs Fortinet FortiGate

Compared 3% of the time

SonicWall TZ vs Fortinet FortiGate

Compared 3% of the time

More Fortinet FortiGate Competitors

Netgate pfSense vs OPNsense

Compared 46% of the time

IPFire vs OPNsense

Compared 11% of the time

Sophos Firewall vs OPNsense

Compared 9% of the time

Sophos UTM vs OPNsense

Compared 3% of the time

Smoothwall Firewall vs OPNsense

Compared 1% of the time

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Netgate pfSense vs Zyxel Unified Security Gateway

Compared 14% of the time

Sophos Firewall vs Zyxel Unified Security Gateway

Compared 12% of the time

WatchGuard Firebox vs Zyxel Unified Security Gateway

Compared 5% of the time

Cisco Meraki MX vs Zyxel Unified Security Gateway

Compared 5% of the time

Sophos UTM vs Zyxel Unified Security Gateway

Compared 5% of the time

More Zyxel Unified Security Gateway Competitors

Product Reports

Buyer's Guide

Fortinet FortiGate

January 2026

Download Fortinet FortiGate product report

Buyer's Guide

OPNsense

January 2026

Download OPNsense product report

Buyer's Guide

Unified Threat Management (UTM)

January 2026

Download Zyxel Unified Security Gateway product report

Also Known As

Fortinet FortiGate Next-Generation Firewall

No data available

Overview

Fortinet FortiGate is a versatile network security tool offering features like VPN, firewall, web filtering, intrusion prevention, and scalability. It is known for its performance and integration with other Fortinet products, making it a preferred choice for robust cybersecurity.

Fortinet FortiGate stands out as a comprehensive cybersecurity solution with strong performance and ease of configuration. It delivers unified threat management, integrating features such as dynamic routing, SD-WAN support, and centralized management. Despite its strengths, improvements in the web interface's stability, pricing structures, and reporting capabilities are needed. Users seek better integration with third-party tools and automation advancements to enhance the experience further. These enhancements, alongside improvements in bandwidth management and the reduction of licensing costs, are points of interest for users looking to capitalize on FortiGate's extensive capabilities.

What are Fortinet FortiGate's key features?

VPN: Ensures secure remote connections.
Firewall: Protects against unauthorized access.
Web Filtering: Blocks malicious sites and content.
Application Control: Manages and controls applications.
Intrusion Prevention: Detects and prevents vulnerabilities.
SSL Inspection: Enhances security by inspecting encrypted traffic.

What benefits should be considered when evaluating Fortinet FortiGate?

Affordability: Offers cost-effective security solutions.
Reliability: Known for consistent and stable performance.
Integration: Seamlessly integrates with other Fortinet products.
Comprehensive Protection: Provides broad threat protection capabilities.

Fortinet FortiGate is widely implemented across industries as a primary firewall system for securing internet gateways and safeguarding data centers. It supports businesses in achieving SD-WAN integration and enhances cybersecurity by providing essential features like antivirus, web filtering, and application control. Enterprises utilize FortiGate for securing remote connections and ensuring compliance with security standards, making it adaptable for different network sizes and industries.

Fortinet

OPNsense is an adaptable open-source firewall and routing platform appreciated for its flexibility, scalability, and user-friendly interface. It is equipped with robust security features and offers excellent reporting and visibility, essential for small businesses and home setups.

OPNsense stands out for its modular design, allowing cost-effective customization. This system supports VPNs and various firewall capabilities, making it suitable for securing networks from malicious traffic. Its frequent updates and extensive documentation, combined with a supportive online community, enhance user experience. However, there is room for improvement in integration with virtual servers and Azure. Scalability and hardware updates are important for large-scale environments, and users desire more reliable VPN solutions and enhanced threat intelligence tools.

What are OPNsense's most important features?

Flexibility: Easily customizable due to its open-source nature.
Robust Security: Advanced security features for network protection.
User-Friendly Interface: Simplified management and configuration.
Frequent Updates: Regular improvements and new features.
Dense Documentation: Extensive resources and community support.

What benefits should users look for in reviews?

Cost-Effectiveness: Open-source design reduces costs.
Scalability: Ability to grow with business needs.
Customizability: Tailored solutions for different requirements.
Community Support: Access to a strong network of resources and peers.

OPNsense is implemented in industries requiring VPN and firewall functions, supporting site-to-site connections, protecting servers, and managing commercial network traffic. Companies apply it for security, UTM, SD-WAN, content filtering, intrusion detection, and prevention, utilizing its open-source nature and effectiveness as a next-generation firewall.

OPNsense

ZyWALL USG Series delivers high-access quality to help businesses satisfy the demand for always-online communications. For internal deployments, the ZyWALL USG Series provides active-passive High-Availability (HA) service to support device or connection failover.

With Device HA Pro service, the ZyWALL USG Series also supports instant failover, so connections are always maintained when a failover event occurs. For external deployments, the ZyWALL USG Series features multi- WAN load balancing/failover and a comprehensive mobile broadband USB modem support list for WAN backup operations. The ZyWALL USG Series also supports IPSec load balancing and failover, providing additional resilience for mission-critical VPN failover with VTI Interface deployments.

ZyWALL USG110/210/310 thoroughly protects networks with industry-leading firewall, Anti-Malware/ Virus, Anti-Spam, Content Filtering, IDP, and Application Patrol functionality. Regulate unauthorized use of Web applications over your network, such as Facebook, Google apps, and Netflix, among others. Zyxel security measures are enhanced with SSL Inspection, blocking threats hidden in SSL-encrypted connections while facilitating deeper policy enforcement. Furthermore, newly improved Content Filtering 2.0 enhances HTTPS Domain Filter, Browser SafeSearch, and Geo IP Blocking for an array of security enhancements to ensure clean Web connections.

Zyxel

Sample Customers

Amazon Web Services, Microsoft, IBM, Cisco, Dell, HP, Oracle, Verizon, AT&T, T-Mobile, Sprint, Vodafone, Orange, BT Group, Telstra, Deutsche Telekom, Comcast, Time Warner Cable, CenturyLink, NTT Communications, Tata Communications, SoftBank, China Mobile, Singtel, Telus, Rogers Communications, Bell Canada, Telkom Indonesia, Telkom South Africa, Telmex, Telia Company, Telkom Kenya

1. Deciso B.V. 2. iXsystems, Inc. 3. EuroBSDCon 4. Netgate 5. Claranet 6. Voleatech 7. Open Systems AG 8. Securebit AG 9. Proxmox Server Solutions GmbH 10. AVM Computersysteme Vertriebs GmbH Additional customers include: T-Systems International GmbH, Deutsche Telekom AG, Vodafone GmbH, 1&1 IONOS SE, OVHcloud, Hetzner Online GmbH, Strato AG, PlusServer GmbH, Host Europe GmbH, United Internet AG, 1&1 Versatel Deutschland GmbH, QSC AG, Bechtle AG, Cancom SE, Computacenter AG & Co. oHG, T-Systems Multimedia Solutions GmbH, Atos SE, Capgemini SE, Accenture plc, IBM Corporation, Hewlett Packard Enterprise Company, Cisco Systems, Inc.

Information Not Available

Buyer's Guide

OPNsense vs. Zyxel Unified Security Gateway

December 2025

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