Managed Nebula vs WireGuard

Managed Nebula and WireGuard are both tools for creating encrypted network connections, but they solve different problems at different layers. WireGuard is a point-to-point tunnel protocol. Nebula is a full mesh networking platform that includes its own tunnel protocol, certificate authority, firewall, and peer discovery system.

Nebula is a fully open-source overlay networking tool that we originally built at Slack and continue to maintain at Defined Networking. Managed Nebula is our cloud-hosted management layer that handles certificate authorities, host configuration, and distribution, while you retain full control of your network’s data plane.

WireGuard is a modern VPN tunnel protocol built into the Linux kernel. It provides fast, simple point-to-point encrypted tunnels using state-of-the-art cryptography.

For a deeper dive into the protocol-level differences, see our blog post on comparing Nebula and WireGuard.

	Managed Nebula	WireGuard
Type	Full mesh networking platform	Point-to-point tunnel protocol
Protocol	Nebula (Noise IX)	WireGuard (Noise IK)
Mesh networking	Built-in, automatic	Manual configuration per peer
Authentication	Certificate-based (Nebula CA)	Pre-shared public keys
Firewall	Stateful with security groups	None (use OS firewall)
Peer discovery	Automatic via Lighthouses	Static endpoint configuration
Certificate mgmt	Managed CA with SSO	Manual key distribution
Open source	Fully (MIT license)	Fully (GPLv2)
Free tier	Up to 100 hosts	Free (self-managed)
Pricing	$1/host/month	Free

The most important distinction is what each tool is designed to do.

Nebula is a complete mesh networking solution. When you add a host to a Nebula network, it automatically discovers and connects to every other host it needs to communicate with. The data plane is fully decentralized. If our control plane goes offline, your existing network continues operating normally. Hosts already have their certificates and can establish new tunnels with each other.

WireGuard is a tunnel protocol. It creates an encrypted connection between two endpoints. To build a mesh network with WireGuard, you need to manually configure a tunnel between every pair of hosts that need to communicate, manage key distribution yourself, handle peer discovery, and set up your own firewall rules. For N hosts in a full mesh, that means configuring N*(N-1)/2 individual tunnels.

Nebula uses certificate-based authentication with its own simplified certificate format. Each host receives a certificate signed by a Nebula Certificate Authority. Adding a new host only requires signing a new certificate. Existing hosts do not need to be reconfigured. They already trust the CA and will accept any validly signed certificate. Managed Nebula handles the CA and certificate lifecycle for you, and we support single sign-on (SSO) on all plans, including the free tier.

WireGuard uses static public key pairs. Each peer must have every other peer’s public key configured in advance. Adding a new host to a network of N hosts requires updating the configuration on all N existing hosts. There is no built-in certificate authority or key distribution mechanism.

Nebula has a stateful packet firewall built directly into the Nebula process. Because Nebula certificates include group membership information, firewall rules can reference groups rather than individual IP addresses. This works similarly to AWS Security Groups. Rules like “allow the WebApp group to access port 443” don’t need to be updated as hosts join or leave the network.

WireGuard has no built-in firewall. Access control must be implemented using your operating system’s firewall (iptables, nftables, pf, etc.) and managed separately on each host. There is no concept of groups or roles at the WireGuard layer.

Nebula uses Lighthouses, special hosts that you deploy and operate, to coordinate peer discovery. When a host starts up, it registers with the Lighthouses. When another host wants to connect, it queries the Lighthouse and both hosts attempt NAT hole-punching to establish a direct connection. For difficult NAT situations, Nebula supports relays that you run yourself.

WireGuard requires at least one side of a connection to have a known, reachable endpoint. It has no built-in peer discovery. If both peers are behind NAT, they cannot connect without external coordination. Solutions like STUN servers or relay infrastructure must be set up separately.

Both Nebula and WireGuard use modern cryptographic primitives and are designed for high performance.

Nebula uses the Noise IX handshake pattern with Curve25519, ChaCha20-Poly1305, and BLAKE2s. We maintain an ongoing, public benchmarking effort. Nebula can saturate a 10 Gbps network on modern CPUs with consistent, predictable resource usage. We publish the full benchmarking methodology, configurations, and raw data publicly in our benchmarking results.

WireGuard uses the Noise IK handshake with the same cryptographic primitives. It benefits from kernel-level implementation on Linux, which can provide lower per-packet overhead for raw throughput. On Linux, WireGuard runs in the kernel, while Nebula runs in userspace.

For most real-world workloads, the throughput difference is not the bottleneck. The operational complexity of managing WireGuard at scale typically matters more than raw tunnel performance.

Both tools are fully open-source.

Nebula is licensed under the MIT license, which is permissive and places no restrictions on how you use, modify, or distribute the software.

WireGuard is licensed under GPLv2 (kernel module) and LGPL/MIT (userspace tools). The kernel module’s GPL license means modifications must be released under the same license.

Choose Managed Nebula if you want:

• A complete mesh networking solution, not just tunnels
• Automatic peer discovery and NAT traversal
• Certificate-based authentication with a managed CA
• Built-in, group-based firewall rules that work like AWS Security Groups
• A management layer that handles configuration distribution
• A network that keeps working even if the management plane goes down

Choose WireGuard if you want:

• A lightweight point-to-point tunnel between a small number of hosts
• Kernel-level performance on Linux for raw tunnel throughput
• A minimal protocol with no additional abstractions
• Full manual control over every aspect of configuration