Defined Networking is publishing this official documentation with their support.Settling new hires into your team can take time and cost a lot of money. Nebula’s creators, Ryan Huber and Nate Brown, founded Defined Networking in 2020 to focus on Nebula development and to broaden the adoption of overlay networking in organizations.Īs of early 2021, Slack continues to be a primary sponsor of the Nebula open source project.
Read Nebula’s Release Notes on GitHub to learn about additions and changes to the project. Introducing Nebula, the open source global overlay network from Slackīy early 2020, the project had over 4,000 stars on GitHub and it was being adopted by organizations of all sizes.Īs of December 2021, Nebula continues to power Slack’s global overlay network of over 50,000 production hosts. Read the announcement posted on Slack’s Engineering blog. Read “Nebula VPN routes between hosts privately, flexibly, and efficiently” at ArsTechnica HistoryĪfter several years of internal development, Nebula was open-sourced by Slack in 2019. Listen a discussion Nebula on TechSNAP Episode 419. Nebula was created to provide a mechanism for groups hosts to communicate securely, even across the internet, while enabling expressive firewall definitions similar in style to cloud security groups. Nebula uses elliptic curve Diffie-Hellman key exchange, and AES-256-GCM in its default configuration. Users can move data between nodes in any number of cloud service providers, datacenters, and endpoints, without needing to maintain a particular addressing scheme. Nebula’s user-defined groups allow for provider-agnostic traffic filtering between nodes.ĭiscovery nodes allow individual peers to find each other and optionally use UDP hole punching to establish connections from behind most firewalls or NATs. Nebula uses certificates to assert a node’s IP address, name, and membership within user-defined groups. Nebula is a mutually authenticated peer-to-peer software defined network based on the Noise Protocol Framework. Inspired by a number of existing tools and projects, Nebula was created to make it much easier to design, deploy, and manage overlay networks that were highly performant, portable, and secure. A Virtual Private Cloud (VPC) is an overlay network offered by cloud infrastructure providers. A SSH tunnel can help create an overlay network. A virtual Private Network (VPN) is an overlay network. Put simply, an overlay network is a virtual network that runs on top of another network. Watch a 90-minute deep-dive on Nebula presented by one of its creators, Ryan Huber, at the All Things Open conference in 2020.Ĭreating a Fast, Secure, Location Agnostic Mesh Network with Nebula Nebula Quick Start guide Overview presentation It’s a great place to get started and learn how to connect a few hosts. How to create your first overlay network is a step-by-step guide that explains how to deploy Nebula. At least one host in overlay network should be a Lighthouse, which helps hosts discover routes to one another and assists in NAT traversal.Host config file defines CA trust, host cert & key, and firewall rules.A single nebula executable runs host firewall and service.Efficiently runs on x86, ARM, MIPS, PPC, and RISC hardware (32 & 64-bit).Packaged for Linux, macOS, Windows, iOS, Android, and FreeBSD.Nebula is written in Go and is designed for portability. Releases include nebula-cert executable to generate keys, certs, CAs, and to sign host certificates. Firewall rules enforced by evaluating certificate “security groups”.Hosts mutually authenticate by validating certificates and CAs.Host certificates are used to securely identify and authorize peers.Nebula uses a PKI model for establishing trust between hosts and networks. Route discovery and NAT traversal assisted by simple “lookup” hosts.Host firewall with groups-based rules engine for overlay traffic.Supports TCP/UDP/ICMP traffic via TUN adapter with split-tunneling.Peer-to-peer, layer 3, virtual network ( Technical Details).Connect any number of hosts with on-demand, encrypted tunnels that work across any IP networks and without opening firewall ports. Nebula is an overlay networking tool designed to be fast, secure, and scalable. Extend network access beyond overlay hosts
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