Why Use a Software Router at All
Consumer routers from ISPs and retail stores are black boxes with limited configuration options, infrequent firmware updates, and often no support for advanced features like VLAN trunking, traffic shaping with CAKE, IDS/IPS, or dynamic DNS with custom providers. A software router running pfSense or OPNsense turns a $50 mini PC into a full-featured network appliance with enterprise-grade capabilities.
The minimum hardware to run either is any x86-64 machine with two network interfaces — one for WAN (your ISP connection) and one for LAN. A mini PC like a Protectli Vault or any used thin client with a dual-NIC works well. Multi-port models let you segment IoT, servers, and trusted clients onto separate physical or VLAN interfaces.
pfSense Overview
pfSense was created by Netgate (formerly BSD Perimeter) and has been the homelab standard firewall OS since the mid-2000s. It is based on FreeBSD and offers a comprehensive web UI for firewall rules, NAT, VPN (OpenVPN, IPsec, WireGuard), DHCP, DNS resolver (Unbound), traffic shaping, and packages for add-ons like pfBlockerNG (DNS-based blocking) and Suricata (IDS/IPS).
In 2023 Netgate changed pfSense CE (Community Edition) to a more restrictive license and moved primary development focus to their commercial pfSense Plus. This created controversy in the homelab community and accelerated migration to OPNsense. pfSense CE remains functional and free, but development pace has slowed relative to OPNsense.
OPNsense Overview
OPNsense was forked from pfSense in 2015 by Deciso, with the stated goals of more frequent releases, a cleaner codebase, and a better UI. It releases bi-weekly updates and two major releases per year. The interface is modern and intuitive, with a dashboard, built-in firmware update mechanism, and better plugin management via the Plugins menu. OPNsense includes WireGuard natively, has Zenarmor (Sensei) integration for DPI-based filtering, and uses a reproducible build system.
OPNsense has become the preferred choice for new homelab deployments. The active development pace, responsive maintainers, and clear roadmap make it feel more like a community-first project. Most new homelab tutorials for software routers now default to OPNsense.
pfSense vs OPNsense Feature Comparison
| Feature | pfSense CE | OPNsense |
|---|---|---|
| Base OS | FreeBSD | FreeBSD (HardenedBSD fork) |
| License | Apache 2.0 (CE); proprietary (Plus) | BSD 2-Clause (fully open) |
| Release cadence | Every few months | Bi-weekly updates + 2 major/year |
| Web UI style | Classic, functional | Modern, responsive |
| WireGuard | Package (unofficial) | Built-in |
| IDS/IPS | Snort, Suricata (packages) | Suricata (built-in), Zenarmor plugin |
| DNS blocking | pfBlockerNG package | Unbound + blocklists, Adguard Home plugin |
| 2FA / MFA | TOTP package | Built-in TOTP + FIDO2 |
| Plugin ecosystem | Large (older) | Growing rapidly |
| Community size | Very large (legacy docs) | Large and growing |
| Recommended for | Existing pfSense users | New installs, homelab |
Frequently Asked Questions
What hardware do I need to run pfSense or OPNsense?
Any x86-64 machine with at least 2 GB RAM, 8 GB storage, and two network interfaces works. Purpose-built appliances from Protectli, Topton, or Qotom are popular because they are fanless, low-power (10–15W), and have 4–6 Intel NICs. A used thin client or mini PC with a USB-to-Ethernet adapter for the second interface also works for starting out.
Can I run pfSense or OPNsense inside Proxmox?
Yes — running your firewall as a VM on Proxmox is a common homelab design. PCI passthrough gives the VM direct access to physical NICs for near-native performance. Alternatively, you can use virtual bridges inside Proxmox and accept a small performance overhead that is imperceptible at home network speeds.
Is OPNsense actually better than pfSense?
For new installs, most homelabbers prefer OPNsense because of its faster development pace, cleaner UI, and the concern about Netgate's commercial direction with pfSense Plus. If you already know pfSense well, staying on it is completely fine — it is still a capable, mature platform.
Do pfSense and OPNsense support VLAN tagging?
Yes. Both support 802.1Q VLAN tagging on physical interfaces, letting you segment your network into multiple logical networks (IoT, servers, trusted clients, guest) from a single physical port. You configure VLAN interfaces in the web UI and set firewall rules between them.