CWWK N100 4×2.5GbE Board as an OPNsense Router: Fanless and Enough?

Dedicated firewall appliances from Protectli or Netgate carry a real premium for their branding, their support contracts and, in Netgate’s case, a first-party OPNsense/pfSense relationship. A parallel cottage industry of Chinese board manufacturers — CWWK chief among them — has spent the last few years selling essentially the same class of hardware: an Intel N100, four or more 2.5GbE ports on Intel’s i226-V controller, fanless passive cooling, for a fraction of the price. I’ve spent time with one of these boards running OPNsense, and the honest answer to “is fanless enough” depends entirely on what you’re asking the CPU to do beyond routing packets.

What’s actually on the board

CWWK’s N100 firewall boards — sold under several near-identical model names and through several storefronts, so check the exact spec sheet on whatever listing you’re buying rather than assuming all “CWWK N100 firewall” listings are identical — build around Intel’s N100, a quad-core Alder Lake-N part with a 6W base TDP and burst clocks up to 3.4GHz, paired with DDR5 memory (a genuine step up from the DDR4 that older firewall-appliance boards were stuck with) and four 2.5GbE ports using Intel’s i226-V controller, the same networking silicon found in considerably pricier appliances. The chassis is entirely passive — a finned aluminium case that is the heatsink, with no fan anywhere in the design — and typical configurations ship with 8GB of RAM and either 128GB or 256GB of NVMe storage, more than enough for OPNsense’s actual footprint. Physical I/O is comparatively spartan: the external USB situation is limited to USB 2.0 ports only, with no USB 3.0 or USB-C exposed on most models, which is a real limitation if you were hoping to use a USB drive for anything beyond an emergency recovery boot.

Why the i226-V chipset matters more than the CPU

The Intel i226-V is the actual reason these boards are worth taking seriously rather than dismissing as generic Chinese hardware — it’s the same 2.5GbE controller found in considerably more expensive firewall appliances, with mature, well-tested driver support in both FreeBSD (which OPNsense runs on) and Linux, and no history of the flaky Realtek-chipset driver problems that have plagued cheaper networking hardware for years. Four ports of genuine, driver-stable 2.5GbE is the actual value proposition here: enough for a WAN port, a LAN port, and two more for VLAN trunking or a dedicated DMZ or IoT segment, at a combined throughput ceiling that a gigabit-only firewall simply can’t touch.

Installing OPNsense without surprises

1
2
3
4
5
6
7
8
9

# OPNsense install: write the installer image to a USB stick from another machine
sudo dd if=OPNsense-25.x-dvd-amd64.img.gz of=/dev/sdX bs=4M status=progress conv=fsync

# On first boot, assign interfaces at the console
# igc0 = WAN, igc1 = LAN, igc2/igc3 = OPT1/OPT2 for VLANs or a DMZ

# Confirm all four i226-V ports enumerate correctly before going further
dmesg | grep igc
# Expect: igc0, igc1, igc2, igc3 all reporting link negotiation cleanly

OPNsense installs cleanly on this hardware with no manual driver work required for the network interfaces — a genuine relief compared to some budget networking hardware where getting every port recognised correctly is its own troubleshooting exercise before you’ve configured a single firewall rule. AES-NI hardware acceleration on the N100 keeps IPsec and WireGuard throughput reasonable without loading the CPU heavily, which matters if any part of your firewall’s job includes site-to-site VPN traffic.

Where “fanless” starts to matter

The board runs completely silent under everyday routing workloads — the actual job most home firewalls spend their entire life doing, and one the N100 handles without breaking a sweat. Where the passive cooling design gets tested is under sustained heavy load: some users report the chassis running warm to the touch during extended periods of high throughput, particularly with Suricata or another IDS engine running inline inspection on every packet rather than just routing them, which is a meaningfully heavier CPU load than routing alone. This isn’t a defect so much as the honest cost of fanless design at this power envelope — a board that ran cool under every workload would need either a fan or a much larger heatsink than the compact chassis allows. Placement matters accordingly: give it clear airflow rather than tucking it into a sealed cabinet, and it copes fine with genuinely continuous home-router duty.

OPNsense vs pfSense on this exact hardware

Both OPNsense and pfSense install and run equally well on this board, since neither firewall distribution asks for anything the N100 struggles to provide, and the choice between them comes down to the same considerations that apply on any hardware — plugin ecosystem, UI preferences, and how each project’s release cadence and community sit with you, rather than anything specific to this board. If you’re already running one or the other elsewhere in your network, matching it here for a consistent management experience across firewalls is worth more than any marginal technical difference between them on hardware this capable for the workload.

What Suricata or an IDS actually costs you here

Running inline IDS inspection changes the load profile completely compared to plain routing, since every packet now gets inspected against a signature set rather than just switched between interfaces, and this is where the N100’s four cores genuinely start to show their limits at sustained multi-gigabit throughput. For a typical home internet connection — even a fast one, well under the 2.5GbE ceiling these ports offer — the N100 handles Suricata comfortably. Pushing genuinely high sustained throughput with full inline inspection active is a different story, and it’s worth testing your actual expected throughput against CPU load in OPNsense’s own dashboard before assuming an IDS-enabled configuration will keep pace at the same speed as plain routing.

DNS-level filtering as a lighter alternative

For anyone weighing whether the CPU overhead of full packet inspection is worth it against a lighter approach, DNS sinkholing run as an OPNsense plugin or a separate small box catches a meaningful fraction of malicious traffic — command-and-control callbacks, known malware domains — for a tiny fraction of the CPU cost of full inline inspection, since it’s filtering at the DNS resolution step rather than inspecting every packet’s payload. It’s not a replacement for Suricata’s deeper inspection capability, but it’s a genuinely useful first layer that this board runs without any of the thermal or throughput concerns that come with inline IDS.

Power draw against the branded alternatives

Idle and light-load power draw on N100-based firewall boards generally sits in a similar low-single-to-low-double-digit watt range as other N100 designs covered elsewhere on this site, and CWWK’s own marketing leans on this efficiency against older DDR4-based firewall appliances that ran hotter for less networking capability. Against a Protectli Vault running a similarly low-power Celeron or N-series chip, the actual power draw difference between the two categories of hardware is generally small — the real gap between “CWWK board” and “Protectli-branded box” is price, warranty, and support, not power efficiency, since both are chasing the same low-TDP silicon.

Naming confusion across storefronts

CWWK, and the closely related Topton and various rebadged listings on AliExpress, sell what amounts to the same board family under a confusing rotation of model codes and marketing names, sometimes changing between listings for what’s functionally an identical revision. Before buying, cross-reference the exact port count, RAM/storage configuration, and specifically the NIC chipset (i225-V and i226-V are both used across this board family depending on revision, with the i226-V being the more mature, better-behaved silicon) against the seller’s own detailed spec sheet or photos, rather than trusting the headline listing title alone. This is the single most important piece of due diligence before buying, since two listings with near-identical titles can genuinely differ in NIC chipset, RAM soldering versus SODIMM, or total port count.

Setting up VLAN trunking for a segmented home network

 1
 2
 3
 4
 5
 6
 7
 8
 9
10

# OPNsense: Interfaces > Other Types > VLAN
# Parent interface: igc1 (the port carrying trunked traffic to your switch)

VLAN tag 10  → assign as OPT1  "IoT"
VLAN tag 20  → assign as OPT2  "Guest"
VLAN tag 1   → LAN (default, untagged management/trusted devices)

# Firewall rules per interface tab, e.g. under OPT1 (IoT):
# Block IoT → LAN (deny access to trusted devices and NAS)
# Allow IoT → WAN (internet access only)

With four physical 2.5GbE ports plus VLAN sub-interfaces on top, this board can carry considerably more network segmentation than most home setups will ever need — a dedicated port for trunked VLAN traffic to a managed switch, a separate physical port for a dedicated DMZ segment if you’re hosting anything internet-facing, and still a spare port for direct connection to a NAS or a second switch, all without oversubscribing a single gigabit uplink the way a cheaper two-port firewall appliance would force you into.

Troubleshooting notes

The most commonly reported issue with these boards is one or more of the i226-V ports failing to negotiate link at the full 2.5GbE speed with certain switches or media converters, instead falling back to 1GbE — usually resolved by forcing the speed explicitly in OPNsense’s interface configuration rather than leaving it on auto-negotiate, or by updating the switch’s own firmware if it’s an older model with known 2.5GbE auto-negotiation quirks. A board that won’t boot from a freshly written USB installer is very often a dd write that didn’t complete cleanly rather than a hardware fault — verify the write with a checksum comparison before assuming the board itself is faulty. Warm-running chassis under sustained load, as covered above, isn’t a fault at all, but if temperatures climb high enough to trigger CPU throttling in OPNsense’s own reporting, that’s the point to reconsider whether inline IDS at your actual throughput is asking more of this specific board than the passive cooling budget can sustain, and either drop to DNS-level filtering or step up to actively-cooled hardware for that workload. Finally, the limited USB 2.0-only external ports mean a USB WiFi dongle or a fast external drive for backups will bottleneck hard on the port’s own bandwidth ceiling — this board’s I/O budget assumes NVMe and 2.5GbE ports do the real work, not the USB ports.

Storage and reliability considerations

The NVMe drive most of these boards ship with is generally a no-name budget part rather than a known-quantity brand, which is worth flagging since OPNsense’s own configuration and logging live on that drive and a firewall that won’t boot is a genuinely bad day. Swapping the stock NVMe for a known brand drive before putting the board into real service is a cheap insurance policy, and it’s worth enabling OPNsense’s built-in configuration backup to an external location regardless of which drive you run, since a firewall’s config is exactly the kind of thing you don’t want to be rebuilding from memory after a drive failure. The board’s single M.2 slot means there’s no redundancy option here — this is a single point of failure by design, consistent with how most compact firewall appliances at any price are built, and the mitigation is a good backup habit rather than any hardware change.

The honest recommendation

For a home firewall doing what most home firewalls actually spend their time doing — routing, NAT, VPN termination, basic firewall rules — this board comfortably outperforms its price against Protectli or Netgate-branded hardware offering similar port counts, and the i226-V chipset means you’re not gambling on flaky drivers to get there. Push it into full inline IDS territory at genuinely high sustained throughput and the fanless design’s thermal budget starts to show its edges, which is the point to either accept DNS-level filtering as a lighter alternative or budget for actively-cooled hardware built for that specific workload. For the overwhelming majority of home networks, this is a serious, capable OPNsense box for a fraction of the branded-appliance price.