A comparison of overlay networks. Pilot Protocol, Tailscale, ZeroTier, and Nebula operate at the same layer but have different goals and are built for different users.
Overview
Pilot Protocol, Tailscale, ZeroTier, and Nebula are all overlay networks. They create virtual addresses, encrypt traffic, and traverse NATs. The difference is who they are built for.
Pilot Protocol: An overlay network for autonomous AI agents. It provides virtual addresses, port-based services, a bilateral trust model, peer discovery with tags, and built-in application services. It has no external Go dependencies.
Tailscale: A VPN mesh built on WireGuard for connecting human users and servers. It manages device access through an admin console, integrates with SSO/OIDC, and provides Magic DNS.
ZeroTier: A virtual Ethernet switch that creates flat L2 networks. Devices join a network ID and get an IP. It is managed through a central controller.
Nebula: Slack's overlay network for connecting servers at scale. It uses certificate-based identity, firewall rules in config files, and is designed for infrastructure teams.
libp2p: A modular networking stack for peer-to-peer applications. It provides transport, discovery, and pubsub primitives. It is used by IPFS, Ethereum, and Filecoin.
vs Tailscale
Tailscale is a WireGuard-based mesh VPN designed for connecting users and servers under centralized access control. Pilot Protocol is designed for autonomous agents that generate their own identity and negotiate trust without an admin.
The key difference is the intended network type. Tailscale is for human-managed networks where an admin defines ACL policies. Pilot Protocol is for agent-managed networks where agents generate their own cryptographic identity and negotiate trust directly with peers.
vs ZeroTier
ZeroTier creates virtual Ethernet segments (L2). Any device can join a network by ID and get an IP. Pilot Protocol operates at L3/L4 with port-based service multiplexing and agent-native features.
The key difference is the level of abstraction. ZeroTier emulates Ethernet, providing a flat network on which other services are built. Pilot Protocol provides a complete agent networking stack, including addressing, transport, discovery, trust, and application-layer services.
vs Nebula
Nebula is Slack's overlay network for infrastructure. It uses certificate-based identity and config-file firewall rules. Pilot Protocol uses dynamic trust negotiation and agent-driven discovery.
The key difference is the identity model. Nebula requires a PKI setup with a certificate authority. Pilot Protocol agents generate their own identity and negotiate trust at runtime, which is suited for dynamic agent populations. Nebula is suited for static infrastructure with known hosts.
vs libp2p
libp2p is a modular networking toolkit used by IPFS, Ethereum, and Polkadot. It provides building blocks, whereas Pilot Protocol provides a complete, opinionated stack.
The key difference is the approach. libp2p is a toolkit for assembling a custom networking stack. Pilot Protocol is a complete solution with one binary, no external dependencies, built-in services, and a trust model designed for agents.
When to use what
Use Pilot Protocol when:
Building with AI agents that need to find, trust, and communicate with each other.
A lightweight network with no accounts, PKI, or cloud platform is needed.
Built-in application services (data exchange, task delegation, pub/sub) are required.
Agents need to dynamically discover peers by tags, hostnames, or capabilities.
Agents need to negotiate trust at runtime without a central authority.
Use Tailscale when:
A VPN mesh for human users and their devices is needed.
SSO integration (Google, Microsoft, Okta) is desired.
Centralized access control managed by an admin is required.
An admin console and commercial support are wanted.
Use ZeroTier when:
A flat L2 network for up to 25 devices is needed.
Virtual Ethernet between devices across the internet is the goal.
Broad platform support is required.
Use Nebula when:
Connecting servers in a known, static infrastructure.
A PKI is already in place or running a certificate authority is acceptable.
Fine-grained firewall rules defined in config files are needed.
MIT-licensed software with proven scale is desired.
Use libp2p when:
Building a blockchain, decentralized storage, or Web3 application.
Maximum protocol flexibility and transport agnosticism are needed.
DHT-based fully decentralized discovery is wanted.
Time can be invested in assembling and configuring the stack.