Protectli Vault VP2420 as a Silent Firewall: Low-Power and Enough?
What you're actually paying for when you buy a purpose-built firewall appliance instead of building one
Contents
Every few months a thread pops up asking whether it’s worth paying Protectli’s prices for a firewall box when a bare N100 mini PC costs a third as much and runs the same OPNsense image. Having actually run a Vault as a router for a stretch, the honest answer is that you’re not paying for performance you couldn’t get cheaper elsewhere — you’re paying for a chassis, a component list, and a support relationship built specifically around running a firewall 24/7 without drama. Whether that’s worth the premium depends entirely on how much you value not thinking about your router.
What’s actually inside the VP2420
The VP2420 is built around an Intel Celeron J6412, a quad-core part running at a 2.0GHz base clock with burst up to 2.6GHz, built on Intel’s 10nm process — a meaningfully more efficient node than the 14nm J4125 that powered Protectli’s previous generation. It supports up to 32GB of DDR4 RAM and up to a 2TB M.2 SATA SSD for storage (no NVMe support on this model, which is a deliberate choice rather than an oversight — NVMe draws more power and generates more heat than a fanless chassis wants to deal with). There’s also 16GB of onboard eMMC, enough to run OPNsense or pfSense entirely from the built-in storage without adding a drive at all, which is how a lot of buyers actually configure it.
The headline feature for a router build is the four 2.5 Gigabit Intel-based Ethernet ports. Intel NICs matter more here than the raw speed number: Intel’s driver support in OPNsense, pfSense, and mainline Linux and FreeBSD is mature and well-trodden, in sharp contrast to some cheaper router boards that lean on Realtek networking silicon and inherit that chipset’s occasionally rockier driver history. If you’ve ever fought a networking driver issue on a DIY router build, that’s usually where it traces back to, and it’s the single biggest practical argument for paying a premium for Intel-networked hardware specifically.
Fanless, and what that costs you in headroom
The whole case is the heatsink — there’s no fan, no moving parts, nothing to eventually wear out or start whining after two years of continuous operation. Reported idle temperatures on the VP2420 sit in the 52–55°C range on the OPNsense dashboard, climbing into the low-to-mid 60s°C under sustained load, which is comfortably within spec for the J6412 and not something to worry about for a device that’s going to sit in a cupboard running forever. The trade-off of a fanless design is that there’s a hard ceiling on how much sustained CPU load the chassis can shed as heat, and a router doing intensive work on all four cores continuously — a busy Suricata IPS ruleset, several concurrent WireGuard tunnels doing real throughput, or a heavyweight IDS/IPS combination — will run warmer than a router doing simple stateless packet forwarding. None of that is unique to Protectli; it’s physics, and it’s the same ceiling any fanless N100 or J6412 box runs into, including DIY builds like the CWWK N100 four-port 2.5GbE board that competes directly in this space at a lower price point.
Setting it up
Where it sits in the Protectli line-up
Protectli’s catalogue is organised almost entirely around this same idea — a fanless steel box, Intel networking, a validated software list — scaled up and down in core count and port count. The VP2420 replaced the older J4125-based VP2410 as the mid-tier four-port option, carrying over the same chassis design while moving to the newer, more efficient CPU. Since this generation launched, Protectli has already begun transitioning the line to a VP2420e variant that drops the onboard eMMC entirely and ships as a bulk-order SKU rather than a retail one — a reminder that this specific configuration, eMMC included, won’t be the current model forever, and that buying used or from remaining retail stock is a reasonable way to get exactly this spec if the eMMC boot option matters to you.
Both OPNsense and pfSense install cleanly via the standard USB installer process, and because every NIC in the box is Intel silicon, there’s no driver-hunting exercise involved — the installer sees all four ports immediately, unlike some DIY boards where a specific NIC needs a community-maintained driver patch to be recognised at all. The one setup step worth doing carefully is deciding port assignment before you start binding interfaces, since the box doesn’t enforce any particular physical port as WAN:
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Label the physical ports on the chassis with a permanent marker matching whatever you assign here — the printed silkscreen numbering doesn’t always match the order the OS enumerates them in, and there’s nothing worse than troubleshooting a “dead WAN” three months later only to realise the physical cable’s in the wrong port.
Real-world throughput expectations
Power draw versus the alternatives
A fanless quad-core x86 box like this draws noticeably more power at idle than an ARM single-board computer running the same firewall software — there’s simply more silicon doing more work, and DDR4 alongside a SATA SSD both add their own baseline draw compared to a Pi-class board’s LPDDR and SD card. Weighed against the machines this box is actually meant to replace, though — an old tower PC pressed into service as a router, or a decommissioned enterprise switch doing double duty — it’s a substantial reduction, running 24/7 for a fraction of what a repurposed desktop costs to leave powered on continuously. If your only comparison point is an ARM router appliance, the VP2420 costs more in ongoing electricity. If your comparison point is anything with a spinning hard drive and a desktop-class CPU left running as a router, the Vault is the more efficient choice by a wide margin, and it buys you four proper 2.5GbE ports and enough headroom for IDS/IPS work that most ARM boards simply can’t offer.
For straightforward routing, NAT, and a firewall ruleset of reasonable size, the J6412 handles multi-gigabit throughput without breaking a sweat — this is a well-understood workload for a modern quad-core x86 chip, and it’s not where these boxes run into trouble. Where the ceiling shows up is CPU-bound inspection: running Suricata or Snort across all traffic, especially in IPS (inline blocking) mode rather than passive IDS mode, adds real per-packet CPU cost that eats into the same four cores doing everything else. VPN throughput is the other place to size expectations correctly — WireGuard is efficient enough to get respectable throughput even on modest hardware, but OpenVPN’s higher per-packet overhead, especially without AES-NI-accelerated ciphers configured correctly, can become the bottleneck well before the 2.5GbE ports do. The J6412 does support AES-NI, so making sure your VPN configuration is actually using hardware-accelerated ciphers rather than a software fallback is worth confirming rather than assuming.
Price: what you’re actually buying
Protectli lets you configure RAM and storage before checkout, and the price climbs meaningfully from a barebone board to a build with 32GB of RAM and a SATA SSD fitted — budget for a build that lands well above what a bare N100 mini PC costs for comparable specs. What that premium buys is a chassis engineered specifically for 24/7 unattended operation, a component list Protectli has validated against OPNsense and pfSense specifically (rather than “should work, probably”), a company that will actually answer support questions about a firewall appliance rather than a general-purpose mini PC vendor who’s never heard of OPNsense, and four Intel NICs instead of a mixed bag of whatever was cheapest that quarter. If you’re comfortable troubleshooting your own driver issues and don’t mind a DIY chassis, a board like the CWWK gets you similar routing performance for less money. If you want to buy a firewall appliance and be done thinking about the hardware, the Vault’s premium is buying exactly that.
Who this isn’t for
If your household network need is genuinely simple — a stock ISP router, one or two VLANs at most, no VPN concentrator, no IDS ambitions — the VP2420’s headroom is mostly wasted, and a cheaper two-port appliance or even a well-configured consumer router will do the job with less money spent and less to configure. This box earns its keep specifically at the point where you want real segmentation, a VPN endpoint that has to actually push meaningful throughput, and enough spare CPU to run inspection without becoming the bottleneck yourself — if that’s not where your network is, or where it’s heading, the extra ports and cores are headroom you’ll never use.
Troubleshooting
A port that should be up shows down in the interface list. Confirm the physical cable is actually in the port you think it is — see the labelling note above — before assuming a hardware fault. Intel’s 2.5GbE controllers have historically had link-negotiation quirks with certain switches and cables at the full 2.5Gbps rate; forcing the port to 1Gbps as a diagnostic step will confirm whether it’s a negotiation issue rather than a dead port, and a firmware or driver update on the OPNsense/pfSense side has usually resolved these over time.
CPU usage climbs uncomfortably high with an IPS ruleset enabled. This is expected behaviour on any four-core firewall appliance running deep packet inspection across gigabit-plus traffic, not a fault. Trim the Suricata/Snort ruleset to the categories actually relevant to your threat model rather than enabling every available rule, and consider running IDS (detect-only) rather than IPS (inline-block) on the categories you’re least confident about, since inline blocking mode costs more CPU per packet than passive detection.
The eMMC install works but feels sluggish for logging-heavy services. The onboard eMMC is fine for the OS and firewall rule evaluation itself, but if you’re running verbose logging, a local IDS ruleset with full packet capture, or anything else that does sustained writes, moving to the M.2 SATA SSD slot rather than relying purely on eMMC avoids wearing out onboard storage that isn’t designed for high write volumes.
Fan noise complaints from a “fanless” unit. There isn’t one — if you’re hearing a fan, it’s coming from somewhere else in the rack, not the Vault itself. Worth ruling out before spending time investigating a non-issue.
Is it worth it
For anyone who’s happy building their own router from a bare board and troubleshooting the odd driver quirk along the way, a DIY fanless N100 or J6412 board is genuinely competitive on raw performance and considerably cheaper. For anyone who wants a firewall appliance that’s been specifically validated against OPNsense and pfSense, ships with Intel networking that just works, and comes from a vendor whose entire business is these boxes rather than general-purpose mini PCs, the VP2420 is a sound way to spend the extra money — treat the premium as buying certainty rather than buying performance, because the performance itself is available more cheaply if you’re willing to do the integration work yourself. Pair it with a properly segmented network — something like a guest Wi-Fi that’s actually isolated — and it’s a genuinely capable, silent centre for a home network that’s outgrown a stock ISP router, sized against an honest homelab threat model rather than against a spec sheet. It’s not the cheapest way to get OPNsense running in a cupboard, and it was never trying to be — it’s the version of that project where someone else already worried about the chassis, the NICs and the thermals, so you don’t have to.
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