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Cisco Secure Firewall vs OPNsense comparison

 

Comparison Buyer's Guide

Executive SummaryUpdated on Apr 5, 2026

Review summaries and opinions

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

ROI

Sentiment score
4.2
Cisco Secure Firewall boosts ROI by enhancing security, reducing costs, and increasing efficiency through simplified management and integration.
Sentiment score
3.0
Numerous users reported substantial financial savings and improved network security with OPNsense compared to alternatives like FortiGate or Sophos.
There is always a return on investment because you find you invest heavily, but your environment is secure and then you are at rest; you do not need to panic.
Specialist Datacenter And Server at IHS Towers
The biggest return on investment when using Cisco Secure Firewall is that there's no waste in any infrastructure cost and licensing costs for us.
Assistant Vice President at PLDT Enterprise
From my point of view, the biggest return on investment when using Cisco Secure Firewall is the single pane of glass, which is a huge plus for us.
Network Engineer at a government with 10,001+ employees
The network attacks reduced by approximately 60% after using that, even without customizing the custom configuration yet.
Senior IT Infrastructure Engineer at a real estate/law firm with 11-50 employees
For a very little investment, I was able to increase the security of my network.
Administrator at a retailer with 10,001+ employees
 

Customer Service

Sentiment score
7.2
Cisco Secure Firewall support is praised for its responsiveness and expertise, though some users experience delays in resolution.
Sentiment score
5.3
OPNsense users mostly find community forums and documentation sufficient, though some express dissatisfaction with official support availability and cost.
I have to provide many logs, yet problems remain unresolved, often requiring workarounds rather than solutions.
VSO at a computer software company with 501-1,000 employees
I have been working with them on firewalls, wireless, switching, and routing, and the support is the best.
Principal Consultant at Epitome Infotech Solutions (P) Ltd
They have expertise and provide solutions for the most difficult problems.
Network Security Administrator at a government with 501-1,000 employees
Compared to some open-source projects with weak support, OPNsense stands out for having both a strong community and commercial backing options.
ISO 27001 Lead Implementer at a consultancy with 11-50 employees
I mainly rely on community support since the solution is open source.
Senior Client Solutions Architect at a tech services company with 1,001-5,000 employees
If you say you do not have one, it is finished. This is where the monopoly starts.
Senior Solutions Engineer at a educational organization with 201-500 employees
 

Scalability Issues

Sentiment score
6.7
Cisco Secure Firewall effectively scales for different user volumes but faces licensing and hardware challenges, especially in on-premises solutions.
Sentiment score
6.8
OPNsense offers scalable and flexible network solutions, effectively supporting mid-sized to enterprise needs with appropriate hardware or virtualization.
When something happens in the device, the failover happens very quickly without any interruption.
Network Unit Head at a comms service provider with 501-1,000 employees
Cisco Secure Cloud now allows us to potentially take the management functions of Cisco Secure Firewall, move it into the cloud, and integrate it with other Cisco security products, managing everything from one single pane.
Senior Network Engineer at a insurance company with 5,001-10,000 employees
I rate the scalability as a number 10.
Cybersecurity Team Leader at EMAK For Computer Manufacturing (ECM)
OPNsense is an extremely scalable solution.
Owner at Networks srl
I use Zenarmor, pinning it to one core for packet inspection, and the CPU performance seems very good.
Senior Client Solutions Architect at a tech services company with 1,001-5,000 employees
OPNsense's scalability is excellent; I just need to resize my hardware and upgrade the server, and voilà, I am good to go.
Senior IT Infrastructure Engineer at a real estate/law firm with 11-50 employees
 

Stability Issues

Sentiment score
7.6
Cisco Secure Firewall is reliable with minimal downtime, strong stability, and consistent performance through effective updates and support.
Sentiment score
7.3
OPNsense is stable with occasional issues; praised for security and UI, performance varies with hardware and resource availability.
We have often encountered split-brain scenarios during failover processes and code upgrades, which have been persistent problems for us.
Senior Manager, Network Engineering at TTi Power Equipment
We work with a cluster with high availability, so if something goes wrong, we have it functioning.
Cisco Secure Firewall offers exceptional performance and stability.
Principal Consultant at Epitome Infotech Solutions (P) Ltd
For home and small network use, OPNsense is also reliable, providing enterprise-grade security at no cost.
ISO 27001 Lead Implementer at a consultancy with 11-50 employees
The only challenge faced was its inadequacy to manage large voice traffic effectively, even with dedicated hardware.
Senior Network Engineer at a comms service provider with 11-50 employees
At the latest code level, I haven't experienced any crashes.
Senior Client Solutions Architect at a tech services company with 1,001-5,000 employees
 

Room For Improvement

Cisco Secure Firewall needs improvements in UI, integration, management, pricing, configuration stability, and overall performance to remain competitive.
OPNsense users face VPN setup issues, inadequate documentation, performance shortfalls, high pricing, and request better usability and features.
My ongoing complaint for the last six years has been the lack of CLI functionality, which hinders my ability to work on the firewall, alongside concerns regarding deployment time.
Senior Manager, Network Engineering at TTi Power Equipment
The GUI is useless for me and frustrates me to a very high degree, which led me to switch to the CLI for configuration.
Network Engineer at a logistics company with 10,001+ employees
Firewall as a Service can scale to a very large extent because it is a cloud-based offering that can scale up to a very large number, which is not a problem.
Chief Technology Officer at Binary Global Limited
I would like the APIs to be more mature and more developed and have more options to automate threat hunting.
Owner at Networks srl
Enhancing its performance for significant amounts of data traffic would make it closer to a perfect solution.
Senior Network Engineer at a comms service provider with 11-50 employees
It would be beneficial if they could create some videos on how to set it up themselves.
Administrator at a retailer with 10,001+ employees
 

Setup Cost

Cisco Secure Firewall is often seen as high-priced, but offers robust features and support, justifying the expense.
OPNsense is a cost-effective, open-source solution for enterprises, reducing expenses compared to FortiGate and Palo Alto alternatives.
It's good to have them, however, it costs us a lot.
It Administration at Dilcon Community School
Basically, the license for the VPNs is for all the interfaces, and that is the thing that is really expensive compared with Palo Alto.
Technical Account Manager at a tech vendor with 5,001-10,000 employees
It's considered a premium, but people pay that price for Cisco.
Principal Consultant at Epitome Infotech Solutions (P) Ltd
I consider the pricing of OPNsense to be high when compared with other market products.
Senior Network Engineer at a comms service provider with 11-50 employees
OPNsense is free, the licensing and setup was easy.
Administrator at a retailer with 10,001+ employees
 

Valuable Features

Cisco Secure Firewall offers robust features like VPN termination, powerful threat prevention, and seamless integration, ensuring effective network security.
OPNsense provides user-friendly configuration, robust security features, and adaptability, making it ideal for enterprise and IT network management.
What stands out positively about Cisco is their training and support, which has effectively prepared engineers to work with their products.
Senior Manager, Network Engineering at TTi Power Equipment
This is very important to my organization, as we work extensively with security because we are a bank, so we can keep the data safe.
Network Security Administrator at a government with 501-1,000 employees
Cisco Secure Firewall allows me to safeguard Layer 7 or Layer 3 and manage the security rules with the business needs of my organization.
The most valuable features include the basic firewall functionality and the GeoIP location services.
Senior Network Engineer at a comms service provider with 11-50 employees
I can have a Wi-Fi VLAN and feel secure that the server network or the VM network that I have on a different VLAN are isolated, and they cannot talk to one another, which adds a great level of security.
Administrator at a retailer with 10,001+ employees
It offers enterprise-grade features such as intrusion detection and prevention system, VPN support, traffic shaping, and web filtering, all without license cost.
ISO 27001 Lead Implementer at a consultancy with 11-50 employees
 

Categories and Ranking

Cisco Secure Firewall
Ranking in Firewalls
3rd
Average Rating
8.2
Reviews Sentiment
6.9
Number of Reviews
464
Ranking in other categories
Cisco Security Portfolio (2nd)
OPNsense
Ranking in Firewalls
5th
Average Rating
8.2
Reviews Sentiment
6.6
Number of Reviews
47
Ranking in other categories
No ranking in other categories
 

Mindshare comparison

As of July 2026, in the Firewalls category, the mindshare of Cisco Secure Firewall is 7.6%, up from 6.0% compared to the previous year. The mindshare of OPNsense is 8.2%, down from 10.8% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Firewalls Mindshare Distribution
ProductMindshare (%)
Cisco Secure Firewall7.6%
OPNsense8.2%
Other84.2%
Firewalls
 

Featured Reviews

RajeshKumar - PeerSpot reviewer
Network Consultant at a outsourcing company with 1,001-5,000 employees
Unified policies have strengthened zero-trust demos and automate rapid threat containment
Feedback and Improvement Areas – Cisco Secure Firewall (Customer Perspective) From a customer point of view, there are a few improvement areas observed while positioning Cisco Secure Firewall in competitive scenarios. 1. Dashboard & Visibility Enhancements Customers often compare firewall dashboards across different OEMs during evaluation. * Competing vendors typically provide more feature-rich and visually detailed dashboards. * There is a perception that Cisco dashboards still require enhancement in terms of visualization, consolidated reporting, and built-in analytics. * Some OEMs advertise additional security capabilities clearly within their publicly available data sheets, making competitive positioning easier. In comparison, Cisco sometimes references separate documentation or explains how certain capabilities (such as anti-spam or antivirus functionality) can be achieved through integration or ecosystem components rather than native, built-in features. This creates a perception gap during customer discussions. Improvement Opportunity: * Enhance dashboard capabilities. * Clearly articulate feature availability in public documentation and data sheets. * Reduce dependency on cross-referenced documentation for commonly compared features. 2. Virtual Firewall / Multi-Instance Capabilities in Lower Models Another competitive challenge relates to virtual firewall capabilities. * Several OEMs provide virtual firewall (VDOM-like) functionality in lower-end models. * In Cisco’s portfolio, multi-instance capability typically starts from higher-end platforms such as the 3K series or higher. * Customers looking for smaller deployments with logical segmentation are often forced to consider higher models, resulting in a price jump. Competitors also offer: * Compact hardware models * Dongle-based firewall appliances * Smaller entry-level products with virtual segmentation In Cisco’s case: * To achieve similar multi-instance functionality, customers must opt for higher-tier models. * This creates a significant pricing gap in entry-level or SMB deployments. This pricing difference becomes a key factor when customers compare solutions. If competitors offer a lower-cost model with virtual segmentation, and Cisco requires a higher platform investment, customers may lean toward alternative OEMs. 3. Documentation Gaps – OT Protocol Visibility In our lab environment, we have deployed Cisco Secure Firewall and are using Application Visibility and Control (AVC) for OT network monitoring. Observations: * OT protocols are clearly visible within application visibility. * The firewall successfully identifies and classifies OT traffic. However: * This capability is not clearly mentioned in publicly available documentation. * When a feature is available and functional, it should be explicitly documented in data sheets and feature guides. The need for third-party integration depends on what we are looking for. Here I am saying that the integration with Cisco NAC can be done because RTC functionality is only available with Cisco ISE and the firewall integration. For other ecosystems, if we use a NAC solution that is not Cisco, we can still integrate it for user authentication, such as with VPN user authentication. But in that case, we don't achieve the same functionality, such as RTC with other NAC solutions. This is one aspect. Another part is that if we are using it, it always happens with some NAC solutions because we have Cisco NAC and Cisco firewall; we want consistent policy across the network, whether the user is on-prem or using VPN services. If this is a unified OEM solution, in that case, we require an agent, such as the Cisco Secure Client. That allows us to easily check the posture status of the remote user and connect to the network effortlessly. But if we are using a third-party solution, we can't achieve that. From a SIEM perspective, certain prerequisites must be fulfilled before integration with Cisco Secure Firewall can be completed. The feasibility of integration depends on the capabilities of the SIEM platform. If the SIEM solution supports the required APIs and event handling mechanisms, similar functionality can be achieved. Therefore, integration itself is generally not the challenge; the key consideration is the desired security outcome within the overall ecosystem. If the customer does not have a SIEM solution and intends to automate quarantine actions or enforce restricted access for users, a Network Access Control (NAC) solution becomes mandatory. In this scenario, the recommended NAC solution is Cisco Identity Services Engine (Cisco ISE). Automated quarantine and dynamic access control workflows are dependent on NAC capabilities. From a feature enhancement perspective for Cisco Secure Firewall, deeper NAC-driven integration adds significant value. 1. TrustSec / Tag-Based Policy Enforcement Cisco ISE supports Cisco TrustSec, which enables Security Group Tag (SGT)-based segmentation. * In traditional (legacy) networks, firewall policies are created based on IP addresses. * With TrustSec, policies are defined based on user identity, group membership, and security tags instead of IP subnets. * When users authenticate to the network, Cisco ISE assigns Security Group Tags (SGTs). * These tags are shared with Cisco Secure Firewall. * The firewall then enforces policies based on SGT-to-SGT rules rather than IP-to-IP rules. Benefits: * Significant reduction in the number of firewall rules * Simplified policy management * Improved scalability * Easier implementation of role-based access control This integration enhances operational efficiency and security posture. 2. Rapid Threat Containment (RTC) Another key capability is Rapid Threat Containment (RTC). If Cisco Secure Firewall detects malicious activity—such as malware download attempts identified via signature-based or advanced threat detection—it can notify Cisco ISE about the compromised endpoint. Based on this input: * Cisco ISE can automatically quarantine the user * The endpoint can be moved to a restricted VLAN * Access can be dynamically limited without manual intervention This automated workflow ensures faster response time and reduces the risk of lateral movement within the network. 3. VPN and Posture Assessment This functionality is not limited to wired or LAN users. For VPN users: * Authentication can be integrated with third-party NAC solutions. * However, if posture assessment (device compliance checking) is required in addition to authentication, Cisco ISE integration with Cisco Secure Firewall becomes essential. Cisco ISE enables: * Endpoint posture validation * Dynamic policy assignment * Automated remediation workflows
Moutaz Sheikh Alard - PeerSpot reviewer
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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Comparison Review

it_user206346 - PeerSpot reviewer
Security Consultant at Webernetz.net - Network Security Consulting
Mar 11, 2015
Cisco ASA vs. Palo Alto Networks
Cisco ASA vs. Palo Alto: Management Goodies You often have comparisons of both firewalls concerning security components. Of course, a firewall must block attacks, scan for viruses, build VPNs, etc. However, in this post I am discussing the advantages and disadvantages from both vendors concerning…
 

Top Industries

By visitors reading reviews
Construction Company
10%
Financial Services Firm
9%
Manufacturing Company
9%
Computer Software Company
8%
Comms Service Provider
17%
Computer Software Company
9%
Manufacturing Company
8%
Financial Services Firm
6%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
By reviewers
Company SizeCount
Small Business192
Midsize Enterprise130
Large Enterprise236
By reviewers
Company SizeCount
Small Business32
Midsize Enterprise6
Large Enterprise8
 

Questions from the Community

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Which is better - Fortinet FortiGate or Cisco ASA Firewall?
One of our favorite things about Fortinet Fortigate is that you can deploy on the cloud or on premises. Fortinet Fortigate is very stable, reliable, and consistent. We like that we can manage the e...
How does Cisco's ASA firewall compare with the Firepower NGFW?
It is easy to integrate Cisco ASA with other Cisco products and also other NAC solutions. When you understand the Cisco ecosystem, it is very simple to handle. This solution has traffic inspection ...
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 client, Open VPN and client, and PPTP client. Both also have intrusion detection a...
What is your experience regarding pricing and costs for OPNsense?
Setup cost is almost zero as one can simulate the whole environment using open source version. Pricing seems fair enough. Open source license allows a beginner to have a complete firewall solution ...
What needs improvement with OPNsense?
When I talk about VPN, I am not completely satisfied with the VPN functions of OPNsense. What I have received so far is that sometimes the VPN route caches for some time and sometimes I want to cha...
 

Also Known As

Cisco Adaptive Security Appliance (ASA) Firewall, Cisco ASA NGFW, Adaptive Security Appliance, Cisco Sourcefire Firewalls, Cisco ASAv, Cisco Firepower NGFW Firewall, Cisco Secure Firewall ASA Virtual - BYOL
No data available
 

Overview

 

Sample Customers

There are more than one million Adaptive Security Appliances deployed globally. Top customers include First American Financial Corp., Genzyme, Frankfurt Airport, Hansgrohe SE, Rio Olympics, The French Laundry, Rackspace, and City of Tomorrow.
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.
Find out what your peers are saying about Cisco Secure Firewall vs. OPNsense and other solutions. Updated: June 2026.
903,182 professionals have used our research since 2012.