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Rayfish

Rayfish is a peer-to-peer mesh VPN: private virtual networks with no central server, where every device is addressed by its cryptographic identity.

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# Rayfish

> Rayfish is a peer-to-peer mesh VPN: private virtual networks with no central server, where every device is addressed by its cryptographic identity.

These docs describe the `ray` CLI and daemon. Networks are closed by default; a coordinator admits peers with one-time invite codes or live approval.

## Docs

- [Introduction](https://rayfish.xyz/docs/01-introduction): Rayfish is a peer-to-peer mesh VPN that creates private virtual networks without any centralized infrastructure. It is built on top of [iroh](https://iroh.computer), a library that provides encrypted QUIC-based peer-to-peer connectivity with automatic NAT traversal, hole-punching, and relay fallback.
- [Getting Started](https://rayfish.xyz/docs/02-getting-started): Install Rayfish on both machines. On the first, start the service, create a network, and mint an invite. Join with that invite on the second.
- [How It Works](https://rayfish.xyz/docs/03-how-it-works): This chapter is the map. The chapters that follow drill into individual subsystems; this one steps back and shows how the pieces fit: the artifacts that exist on the wire, and how a network takes shape as peers join.
- [Magic DNS](https://rayfish.xyz/docs/04-magic-dns): Magic DNS lets you reach peers by name instead of IP. Every peer gets a hostname, chosen via `--hostname` at create/join time, falling back to a default you set with `ray up --hostname <name>`, and finally to a random name from a word list.
- [File Sharing](https://rayfish.xyz/docs/05-file-sharing): Rayfish includes peer-to-peer file sharing over the mesh. Files are content-addressed via blake3 and transferred directly between peers, with no cloud storage and no size limits.
- [Access Control](https://rayfish.xyz/docs/06-access-control): This chapter is about **traffic control**: who can talk to whom *once they're in* the network. That's a different question from **admission**, who is allowed to join in the first place, which the coordinator gates with invite codes and live approval (see **Membership** and **Getting Started**). Admission decides membership; everything below decides which packets flow between members.
- [Declarative Provisioning](https://rayfish.xyz/docs/07-declarative-provisioning): `ray apply` reads a YAML file, creates missing networks, reconciles enrolled machines, publishes firewall suggestions, and installs mesh SSH grants on controlled machines.
- [Local Device Firewall](https://rayfish.xyz/docs/08-local-device-firewall): The local device firewall gives each peer control over its own inbound and outbound traffic. It is the fine-grained layer on top of network segmentation: which networks a host joins decides *who can reach it at all*, and the firewall decides *what those peers can do*, by direction, protocol, port, and per-network scope. It is bottom-up by default ("I decide what reaches my ports"), but on any network the coordinator can suggest rules that ride in the signed network state; see the **Access Control** chapter.
…

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