OPNsense Alternatives (2026): 7 Firewall and Router Platforms

OPNsense calls itself an open source, feature-rich firewall and routing platform, with a stateful firewall for IPv4 and IPv6 and a live view of what's being blocked or let through. That's a lot to give up, so people searching for alternatives usually have a specific reason: a support contract the boss insists on, a love of the command line, hardware they already own, or an office that needs a Windows-friendly server.

Below are seven platforms grouped by the style of system they are, so you can compare like with like instead of reading a long mixed list.

Which pfSense edition does a guide mean?

If pfSense is on your shortlist, check the edition first. Its site says the staff have direct access to the development team, while Netgate sells pfSense Plus and TNSR software, backed by TAC support subscription options, professional services and training.

So one name covers more than one thing. A forum post, a video tutorial and a reseller's quote might each be describing a different edition. Before you follow a guide or compare features, check which edition it refers to, and whether a support subscription is part of what's being described.

If those two are the only names on your shortlist, our detailed comparison of the pair goes further.

Open-source firewall distributions

These do the closest job to what you run now: a dedicated box or virtual machine whose main purpose is protecting a network.

IPFire

It presents itself as an open source firewall, and links remote workers, offices and data centres through site-to-site VPNs and zero-trust tunnels. A good fit if branch connections are part of the brief.

pfSense

One name, more than one edition, with Netgate selling pfSense Plus beside it along with professional services and training. Choose the edition first, then decide whether a support subscription from Netgate is worth having for your network.

Router-first systems

These suit people who think of the box as a router first and a firewall second, or who like to manage everything from a terminal.

MikroTik RouterOS

It's the operating system that runs MikroTik's own devices, so it suits people happy to buy that maker's hardware. Its older documentation site has been frozen in favour of a newer manual, so use the current one.

VyOS

An open-source network operating system where routing protocols, firewall rules and NAT are all managed through one CLI and one API. Appealing if you like to script and automate.

Server-style gateways for offices

These bundle the gateway with other server jobs, which can suit a small business that wants fewer boxes in the cupboard.

ClearOS

It calls itself a Linux server, network and gateway operating system, and has a Home Edition aimed at people running an office from home.

EndianOS

For businesses, Endian builds UTM security gateways, and EndianOS runs its IT and OT gateways. That makes it the only option on this list that names industrial (OT) networks as well as office IT.

Zentyal

A Linux server that slots into an existing Microsoft setup with native Active Directory compatibility, and bundles DNS, DHCP, firewall, VPN, an HTTP proxy and a certificate authority.

Your VPN tunnels will narrow the list

Remote access is often what decides a firewall move. IPFire is the clearest about it, describing site-to-site VPNs and zero-trust tunnels for linking remote workers, offices and data centres. Zentyal lists VPN among the services it bundles, next to DNS, DHCP and a certificate authority. For VyOS, check its documentation for the tunnel types you use; what it stresses is one CLI and API covering routing protocols, firewall rules and NAT.

Write down every tunnel you run today, who uses it and from where, then look up that exact type in each candidate's documentation before you go any further. A platform that can't carry your remote staff is out, however good the rest of it looks.

Matching the platform to the people who'll run it

The best firewall on paper is the one your team can look after at two in the morning. If one person runs the network and loves a web dashboard, a firewall distribution keeps life familiar. If your admin lives in a terminal and automates everything, a router-first system with a single CLI and API may feel more natural.

If the person in charge is really an office manager who also looks after user accounts and file shares, a server-style gateway puts more of their day in one place. Think about who'll be on call before you think about features. And if that person might leave, choose something a successor could pick up from its documentation without a long handover.

Five checks before you swap a firewall

• Who answers when something breaks: a community forum, a vendor support subscription, or you alone?
• If RouterOS is on the list, are you happy to run MikroTik's own devices?
• How will you back up the configuration, and how quickly could you restore it onto a fresh box?
• Will the stateful IPv4 and IPv6 filtering you rely on carry across, and can you still watch blocked and passed traffic live?
• Is the documentation current, and does it match the edition you're about to install?

Seven platforms in one table

Platform	Style	Who tends to choose it
IPFire	Firewall distribution	Teams joining branches and home workers
pfSense	Firewall distribution	Admins wanting a vendor support option
MikroTik RouterOS	Router-first	Owners of that maker's hardware
VyOS	Router-first	Engineers who script and automate
ClearOS	Office gateway	Home offices and small sites
EndianOS	Office gateway	Sites with OT and IT networks
Zentyal	Office gateway	Windows domain offices

A safe way to trial a new firewall

Swapping a firewall is the kind of change that takes the whole household or office offline if it goes wrong, so test it away from the live network first.

1. Export a configuration backup from your current box and keep a copy off the device.
2. Write down every rule, port forward, VPN tunnel and DHCP reservation you rely on, in plain language.
3. Build the new platform in a virtual machine or on spare hardware, not the live router.
4. Recreate your rules one at a time, testing each before you add the next.
5. Test IPv4 and IPv6 traffic, remote VPN access and anything with a fixed address, such as printers or cameras.
6. Cut over at a quiet time with the previous unit switched off but cabled and ready to swap back.
7. Run the new setup for a fortnight before you wipe or sell the old hardware, and note anything that misbehaved in that time.

If a support contract is the reason you're moving, ask the vendor exactly which edition and services that contract covers before you buy any hardware.

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Frequently asked questions

Does every option here have a web dashboard?

Check each project's documentation. VyOS stresses one CLI and API, so if you need a browser-based screen, confirm it exists before you build.

Which option suits an office with a Windows domain?

Zentyal is the one built around Active Directory, so start your testing there.

Can I import my OPNsense configuration into one of these?

Don't count on it. Plan to rebuild your rules by hand, and check each project's documentation for any migration help before you start.

Which option is built with industrial networks in mind?

EndianOS is the only one here that names OT gateways alongside IT, so start there if machines on a factory floor sit behind the firewall.

Should a home lab and an office use the same platform?

Not necessarily. A spare-room setup and a company network have different needs, so choose for where the box will sit and who'll look after it, then read that edition's own notes.