WireGuard vs OpenVPN on Your Firewall

For a decade, “set up a VPN on your firewall” meant OpenVPN. Then WireGuard arrived, got merged into the Linux kernel, gained native support on OPNsense and pfSense, and rapidly became the default recommendation for homelab remote access. That shift is real and largely correct — but “WireGuard won, delete OpenVPN” is too simple. The two protocols make genuinely different tradeoffs, and there are still situations where OpenVPN is the better tool.

This compares the two as you’d actually deploy them on a firewall (this is about the protocols; for OPNsense-vs-pfSense WireGuard ergonomics specifically, see our WireGuard on OPNsense vs pfSense comparison).

TL;DR

	WireGuard	OpenVPN
Protocol age / maturity	Newer, kernel-integrated	Long-established, battle-tested
Codebase size	Small (easier to audit)	Large
Throughput on equal hardware	Generally higher	Lower (more overhead)
CPU model	Single-thread-sensitive	AES-NI helps; multi-threaded options
Transport	UDP only	UDP or TCP
NAT / restrictive-network traversal	Good (UDP)	Better (can run over TCP/443)
Connection model	Stateless, always-on feel	Session-based
Auth model	Static key pairs	Certificates, optional user/pass, MFA-friendly
Per-user revocation	Manual (remove peer key)	Mature PKI (revoke a cert)
Roaming (changing networks)	Excellent	Good
Client availability	Excellent, lightweight	Excellent, ubiquitous

Short version: WireGuard is the right default for most homelab remote access and site-to-site. Keep OpenVPN in your pocket for restrictive networks (where TCP/443 camouflage matters) and for deployments that need certificate-based PKI with clean per-user revocation.

Performance

WireGuard’s design — a lean codebase, modern fixed cryptography (no cipher negotiation), and kernel integration — gives it lower overhead and generally higher throughput than OpenVPN on the same hardware. OpenVPN carries more protocol overhead and historically ran largely single-threaded in its classic configuration (newer OpenVPN versions and DCO — Data Channel Offload — improve this considerably, which is worth knowing if you’re comparing modern builds).

The practical caveat we always repeat: VPN throughput on a firewall tracks CPU performance more than the protocol label. WireGuard is single-thread-sensitive; OpenVPN benefits from AES-NI hardware acceleration for its data channel. On a weak CPU, neither will saturate a fast link. We deliberately don’t publish fixed Mbps figures here as if universal — they depend on the CPU, MTU, the link, and the client. For sizing the hardware, see our firewall hardware tiers guide.

NAT traversal and restrictive networks

This is OpenVPN’s standout remaining advantage. WireGuard is UDP only. That’s fine on most home and mobile networks, but some restrictive environments — hotel Wi-Fi, corporate guest networks, captive portals — block or throttle arbitrary UDP while letting TCP/443 through because it’s indistinguishable from normal HTTPS.

OpenVPN can run over TCP on port 443, making it blend in with web traffic and punch through networks that block UDP. If your use case is “I need to reliably reach home from any sketchy network on the planet,” OpenVPN-over-TCP/443 is more likely to just work. (There are WireGuard-over-TCP wrappers and obfuscation tools, but that’s added complexity OpenVPN gives you natively.)

For normal home/mobile use, WireGuard’s UDP is not a problem and its always-on, fast-reconnect behavior is a pleasure.

Authentication and revocation

The auth models differ meaningfully:

• WireGuard uses static public/private key pairs per peer. It’s simple and secure, but there’s no built-in PKI. Revoking access to a device means removing its peer entry from the server. For a handful of your own devices, this is trivial. For many users, manual key management gets tedious.
• OpenVPN uses a certificate-based PKI. You can issue per-user certificates, layer username/password and TOTP/MFA on top, and revoke a single user’s certificate cleanly through a certificate revocation list. For multi-user deployments where people come and go, this is a real operational advantage.

If your VPN serves an organization or a household where you want auditable, individually revocable access with optional MFA, OpenVPN’s model is more mature. If it’s your three personal devices, WireGuard’s key-per-device simplicity is fine.

Roaming and reliability

WireGuard handles network changes gracefully — switch from Wi-Fi to cellular and the tunnel re-establishes almost transparently because of its stateless design and the way it tracks the latest valid endpoint. It “feels” always-on. OpenVPN reconnects fine but is more session-oriented, so transitions can be a touch less seamless. For a phone that constantly changes networks, WireGuard is the nicer daily-driver experience.

Security posture

Both are considered secure when configured correctly. WireGuard’s small codebase (a few thousand lines versus OpenVPN’s much larger surface) is genuinely easier to audit and reason about, and it uses a fixed, modern cryptographic suite with no negotiation to misconfigure. OpenVPN is highly configurable, which is powerful but also means there are more ways to set it up suboptimally (weak ciphers, bad options). OpenVPN’s longevity means it’s been heavily scrutinized and hardened over many years.

Neither protocol is the weak link in a typical homelab; your key/cert hygiene and firewall rules are.

Client experience

• WireGuard clients are lightweight and available on all major platforms; config import via a small file or QR code is fast, and the apps are simple.
• OpenVPN clients are equally ubiquitous and well-supported, if a bit heavier; the .ovpn profile format is universally understood.

Both are good. WireGuard’s clients feel a little more modern and minimal.

Which should you run?

Default to WireGuard if:

• This is personal/homelab remote access for a manageable number of your own devices.
• You want the best throughput-per-CPU and the smoothest roaming.
• Your clients connect from normal home/mobile networks.

Choose (or keep) OpenVPN if:

• You need to traverse restrictive networks that block UDP — TCP/443 is your escape hatch.
• You need certificate-based PKI with per-user MFA and clean revocation.
• You have an existing, working OpenVPN deployment with no pain — there’s no urgent reason to rip it out.

Plenty of setups run both: WireGuard as the daily driver, OpenVPN-over-TCP/443 as the break-glass fallback for hostile networks. On a firewall that supports both natively, that belt-and-suspenders approach costs little.

Bottom line

WireGuard deserves its status as the modern homelab default — faster on equal hardware, simpler, with excellent roaming. But OpenVPN isn’t legacy cruft; its TCP/443 camouflage and mature certificate PKI are real capabilities WireGuard doesn’t natively match. Pick WireGuard first, and reach for OpenVPN when restrictive networks or multi-user PKI requirements make its strengths matter.

Further reading

• WireGuard on OPNsense vs pfSense
• Firewall hardware tiers: Celeron vs N100 vs i5
• OPNsense vs pfSense 2026 head-to-head