OPNsense vs pfSense on Proxmox: Which Virtual Firewall Is Better?

Running a firewall as a Proxmox virtual machine can reduce hardware requirements and make network services easier to back up, migrate and restore. OPNsense and pfSense are two of the most established firewall platforms for this design.

Both can provide routing, VLANs, multiple internet connections, VPN access, traffic shaping, intrusion detection and high availability. Both are based on FreeBSD and can run as virtual machines on Proxmox.

The better choice depends on how much you value interface design, update frequency, package availability, licensing and commercial support. OPNsense often feels more modern and moves faster. pfSense has a longer operational history, extensive documentation and a large installed base.

Can OPNsense and pfSense Run on Proxmox?

Both platforms support virtual deployment.

OPNsense provides documentation for installing its firewall from an ISO image inside a virtual machine. Its installation images can run from virtual disks as well as physical storage. citeturn165624search0turn165624search10

Netgate provides a dedicated guide for virtualizing pfSense on Proxmox. The guide covers the required Proxmox networking and virtual machine configuration and states that the process applies to current Proxmox releases. Netgate also recommends a type one hypervisor such as Proxmox for production virtualization. citeturn165624search2turn165624search8

Proxmox uses bridged networking. A virtual bridge acts like a software switch, allowing virtual network interfaces to connect to physical network cards, VLANs or isolated guest networks. A virtual firewall commonly receives one interface for the external connection and another for the internal network. citeturn165624search18turn165624search13

The physical and virtual network design matters more than the firewall brand. A configuration mistake can disconnect the Proxmox host or expose its management interface to the internet.

Which Has the Better Interface?

OPNsense generally has the more modern interface.

Its menus, dashboards and reporting tools are designed around a newer presentation style. Administrators moving from commercial security appliances may find its navigation easier to learn. Recent OPNsense releases have continued converting older components to newer interface and API frameworks. citeturn399469search1turn399469search9

pfSense uses a more traditional administration interface. It can appear dated, but the layout is familiar to experienced pfSense administrators. The main sections for interfaces, firewall rules, services, VPNs, system status and diagnostics remain clearly separated. citeturn165624search38

Interface preference should not decide the project alone. A firewall that looks modern can still be configured incorrectly. However, a clearer interface can reduce mistakes when administrators frequently create aliases, change rules or investigate network traffic.

OPNsense has the advantage for usability. pfSense has the advantage for teams that already know its established workflow.

Which Has Better Firewall Features?

The core capabilities are broadly similar.

Both platforms support stateful firewall rules, network address translation, VLANs, multiple internet connections, traffic shaping, captive portals and common VPN technologies.

OPNsense includes integrated intrusion detection and prevention using Suricata. It also provides application control, reporting, high availability and plugin based extensions. Its official feature description positions the platform as a firewall and routing system with integrated inline intrusion protection. citeturn399469search13

pfSense can be extended through its package repository. Packages provide graphical integration for tools such as HAProxy, additional VPN technologies and intrusion detection systems. The available package list can change between releases, so administrators should confirm that required packages remain supported before upgrading. citeturn399469search19turn399469search21

For ordinary routing and firewall work, neither product has a decisive technical advantage. The difference becomes more visible when you need a particular plugin, reporting interface or security service.

Which Has Better Updates?

OPNsense follows a predictable and relatively frequent schedule.

Its community edition normally receives two major releases each year, with minor updates approximately every two weeks. OPNsense recommends keeping production systems on the tested production update channel. Major upgrades run offline, so console access or a reliable rollback method is important. citeturn399469search2

Frequent releases can deliver security fixes and features quickly. They also require administrators to read release notes and test upgrades more regularly.

pfSense uses separate release tracks for pfSense Community Edition and pfSense Plus. The two editions have different versioning formats, and pfSense Plus contains premium capabilities that are not available in Community Edition. citeturn399469search7turn399469search12

pfSense may appeal to administrators who prefer a slower operational rhythm. OPNsense may appeal to teams that want more frequent development and interface improvements.

Neither firewall should be upgraded blindly. Create a Proxmox snapshot or backup, export the firewall configuration and make sure console access works before beginning.

How Do Their Licensing Models Differ?

OPNsense offers a free community edition and a paid Business Edition.

The community edition receives new development first. The Business Edition follows a more selective update path after changes have received wider community testing. It also includes commercial repository access and additional business focused functions. citeturn399469search0turn399469search3turn399469search4

pfSense is divided into pfSense Community Edition and pfSense Plus. Community Edition is the open source project, while pfSense Plus includes additional capabilities and is associated more closely with Netgate products and commercial offerings. citeturn399469search12

This distinction matters when planning long term support. Do not compare only the free editions and assume every commercial feature is included.

A business should decide whether it needs vendor support, conservative updates, centralized management or certified hardware. The cost of support may be small compared with the cost of a prolonged firewall outage.

Which Is Better for VPNs?

Both platforms support common site to site and remote access VPN designs.

OPNsense includes support for technologies such as IPsec, OpenVPN and WireGuard. WireGuard has become part of its standard firewall ecosystem, and OPNsense provides plugins for additional VPN and networking services. citeturn399469search14turn399469search8

pfSense supports IPsec and OpenVPN directly, while WireGuard is available as an add on package in supported pfSense Plus and Community Edition releases. citeturn399469search19turn399469search24

For a simple remote access VPN, either platform can work. The more important questions are client support, authentication, high availability behaviour and how the VPN interacts with firewall rules.

Administrators planning high availability should test active VPN sessions during failover. Some protocols may reconnect cleanly, while others may need manual or client side recovery.

Which Is Better for High Availability?

Both OPNsense and pfSense support redundant firewall designs using CARP.

A typical design uses two firewall virtual machines, a shared virtual address and a dedicated synchronization network. When the primary firewall fails, the secondary system can assume the shared address.

OPNsense documents CARP based redundant configurations, including virtualized environments. citeturn165624search14

Netgate also documents pfSense high availability with primary, secondary and synchronization interfaces. citeturn165624search41

Virtual high availability requires careful Proxmox and network configuration. Both firewall virtual machines should not depend on the same physical host if protection from host failure is required. They should run on separate Proxmox nodes with suitable network connectivity.

Proxmox high availability alone is not an immediate firewall failover system. Restarting a failed firewall virtual machine on another node takes time. A firewall pair can normally provide faster network continuity.

What Are the Risks of a Virtual Firewall?

A virtual firewall creates dependency between network access and the virtualization platform.

If the Proxmox node is stopped, the firewall may stop too. This can make it difficult to access the Proxmox interface remotely during an outage.

Keep a local console path and document how to reach Proxmox when the firewall virtual machine is unavailable. Consider using a dedicated management interface or isolated management network that does not depend entirely on the virtual firewall.

Passing physical network cards directly to the firewall can provide clear interface ownership, but it reduces migration flexibility. Using Proxmox bridges makes migration easier, but it increases reliance on correct bridge and VLAN configuration.

The firewall should also start before most dependent virtual machines. Configure an appropriate startup order and delay so that routing, DNS and VPN services become available before applications attempt to connect.

Which Virtual Firewall Should You Choose?

Choose OPNsense when you prefer a modern interface, frequent updates, integrated security features and an open platform with a clear community and Business Edition structure.

It is particularly attractive to new deployments where the administrators have no previous commitment to either firewall.

Choose pfSense when your team already has pfSense experience, relies on specific pfSense packages or values Netgate’s documentation, appliances and commercial ecosystem.

It remains a strong choice for stable environments with established procedures.

For a new Proxmox homelab or small business deployment, OPNsense is often easier to approach and customize. For an organization with existing pfSense expertise, migration to OPNsense may provide little immediate benefit.

The best virtual firewall is the one your team can configure safely, update consistently and recover quickly. Test both platforms with your VLANs, VPNs, internet connection and failover requirements before routing production traffic through either one.