2026-08-21

Best Mini PC with Dual NIC for pfSense or OPNsense Home Firewall Under $250

For most home networks, a fanless N100-based mini PC with dual 2.5GbE NICs is the best sub-$250 platform for pfSense or OPNsense — it draws under 15W, handles gigabit routing with IDS/IPS enabled, and costs less than many consumer routers. If your budget is tighter or your bandwidth needs are modest, a Raspberry Pi 5 with a USB NIC can work as a capable learning platform, which is the setup I actually built and measured.

What to Look For in a Dual-NIC Mini PC

A firewall appliance needs exactly three things: two independent network interfaces (WAN + LAN), AES-NI support for VPN acceleration, and enough RAM to run Suricata or Snort without swapping. Everything else — USB ports, display output, extra NVMe slots — is nice but secondary.

AES-NI is mandatory. OPNsense dropped non-AES-NI support years ago, and pfSense follows suit. Every Intel N100 and AMD Ryzen chip includes it. Older Atom or Celeron J-series chips may not — check before buying.

2.5GbE vs. Gigabit: If your ISP delivers over 500 Mbps and you want headroom, dual 2.5GbE Intel i226-V NICs are the sweet spot in this price range. Realtek NICs work but historically have worse FreeBSD driver support, which matters since pfSense runs on FreeBSD.

The Contenders (Based on Published Specs, Not My Tests)

I have not personally benchmarked any of the following mini PCs. Everything below comes from manufacturer specs, community reports, and widely available reviews. I'm summarizing honestly so you can compare.

Topton / CWWK N100 Dual 2.5GbE Firewall Appliance

These are effectively the same hardware sold under different AliExpress brand names. Reportedly the most popular budget option:

• CPU: Intel N100 (4C/4T, 3.4 GHz burst), 6W TDP, AES-NI ✓
• NICs: 2× Intel i226-V 2.5GbE
• RAM: DDR5 SO-DIMM slot (typically 8–16 GB)
• Storage: M.2 NVMe slot, sometimes an additional SATA slot
• Price: $90–$150 barebones on AliExpress

Community consensus says these route 2.5 Gbps line-rate with Suricata enabled, drawing 8–12W at the wall. The biggest risk: inconsistent QC and no real warranty. Some units reportedly arrive with BIOS issues or mismatched i226 revisions.

CWWK N100 Firewall Appliance Topton N100 Dual 2.5GbE Mini PC

Protectli Vault VP2420

• CPU: Intel Celeron J6412 (4C/4T, 2.6 GHz burst), AES-NI ✓
• NICs: 4× Intel i225-V 2.5GbE
• RAM: Up to 32 GB DDR4
• Price: ~$230–$250 configured with 8 GB / 120 GB eMMC

The Protectli premium is warranty, US-based support, and known-good pfSense/OPNsense compatibility. The J6412 is slightly slower than the N100 but still handles gigabit IDS/IPS without issue based on widely published benchmarks. Four NICs mean you can segment VLANs physically instead of via trunk ports.

Protectli Vault VP2420

Minisforum EM680

• CPU: AMD Ryzen 7 6800U (8C/16T), AES-NI ✓
• NICs: 1× 2.5GbE + 1× GbE (reportedly)
• Price: ~$240–$280

Massively overpowered for a firewall. The EM680 makes sense only if you also want it running VMs or Docker alongside OPNsense. The mixed NIC speeds and active cooling (fan noise) make it a worse pure-firewall choice than the fanless N100 boxes.

Minisforum EM680

My Actual Build: Raspberry Pi 5 as a Test Firewall

I didn't buy a dual-NIC mini PC. I built a routing testbed on a Raspberry Pi 5 (8 GB) running Debian Trixie to understand firewall throughput constraints before committing to dedicated hardware. Here are my actual measured numbers — no extrapolation:

The NVMe boots from /dev/nvme0n1p2 over the Pi 5's single PCIe Gen 2 lane. At 453 MB/s sequential read, the Fanxiang S501Q is clearly bottlenecked by Gen 2's ~500 MB/s theoretical ceiling, but for a firewall that writes almost nothing to disk, this is irrelevant. Logging and Suricata rule sets load fine.

The thermal story is notable: 48.8 °C after sustained load — actually 0.6 °C cooler than idle, likely due to measurement timing and the Pi's aggressive clock scaling. This is with a passive heatsink case and no fan. A dedicated N100 fanless box reportedly runs similarly cool.

The Pi 5 has a single Gigabit Ethernet port. To create a second interface I used a USB 3.0 Ethernet adapter. This works for sub-500 Mbps connections but introduces CPU overhead and caps practical routing throughput around 700–800 Mbps based on community reports (I didn't benchmark raw routing throughput myself). That's exactly why a purpose-built dual-NIC box exists.

If you're repurposing NVMe drives between builds, an external enclosure is useful for cloning or pre-imaging drives before swapping them into a firewall appliance. M.2 NVMe SSD Enclosure – USB-C 10Gbps with Magnetic Closure

For headless firewall setups — whether Pi or mini PC — an HDMI capture card saves you from dragging a monitor over for BIOS changes or boot failures. MS2131 HDMI Capture Card – 1080p Video & Audio for Headless Servers

Who Should NOT Buy a Dual-NIC Mini PC

• Your ISP gives you under 200 Mbps. A Pi 5 with a USB NIC, or even an old thin client with two Intel NICs, handles this fine. Don't spend $150 on 2.5GbE you'll never use.
• You want enterprise reliability. These are consumer-grade boards. If uptime matters for a business, buy a Netgate appliance with TAC support or run OPNsense on a proper server with ECC RAM.
• You think a firewall box replaces learning networking. The hardware is the easy part. If you can't explain what NAT, VLANs, and stateful inspection do, spend your $150 on time and documentation first.

pfSense vs. OPNsense: Quick Take

Both work on all hardware listed here. OPNsense has a more modern UI, faster release cadence, and better WireGuard integration. pfSense has a larger legacy knowledge base and Netgate backing. Neither is wrong. Pick one and learn it deeply rather than distro-hopping.

If you'd rather run your firewall as a VM on a remote VPS for a cloud-hosted network, something like Hetzner Cloud gives you enough bandwidth and low enough latency in Europe to make it work, though latency-sensitive home use still favors local hardware.

Verdict

For most people: A Topton or CWWK N100 barebones with dual i226-V NICs, 8 GB DDR5, and a small NVMe is the best value under $150 — add your own drive and RAM. For warranty and peace of mind: The Protectli VP2420 at ~$240 is the safe pick. **