Multiplayer games are more accessible than ever, thanks to tools like FishNet and Unity Relay. In this guide, we’ll explore how to:

• ✅ Set up FishNet with Unity Transport (UTP)
• ✅ Use Unity Relay for seamless P2P connections
• ✅ Host and join games with join codes
• ✅ Optimize networking for a 3D fishnet-style game

key resources:

• FishyUnityTransport 2.0.0-pre.2 (Relay-compatible transport)
• Fish-Networking Getting Started (Sample project)

Why FishNet + Unity Relay?

FishNet is a high-performance networking solution for Unity, while Unity Relay solves NAT traversal without dedicated servers. Together, they enable:

• P2P connections without port forwarding.
• Cross-platform play (PC, mobile, consoles).
• Secure connections via Relay’s encrypted tunnels.

Setting Up FishNet with Unity Transport

Installation

1. Install FishNet via the [Asset Store](https://assetstore.unity.com/packages/tools/network/fish-net-networking-evolved-207815).
2. Add FishyUnityTransport:
   • Download [FishyUnityTransport 2.0.0-pre.2](https://github.com/ooonush/FishyUnityTransport/releases/tag/2.0.0-pre.2).
   • Import it into your project (`FishNet → Import Transport`).
3. Configure Transport:
   •  In `FishNet Manager`, assign FishyUnityTransport.
   • Set Protocol Type to `Relay` for UTP + Relay support.

Conclusion

With FishNet + Unity Relay, you can build scalable, secure multiplayer games without complex server setups. Try it in your next project!

Resources:

– [FishyUnityTransport GitHub](https://github.com/ooonush/FishyUnityTransport)
– [Fish-Networking Starter Project](https://github.com/maxkratt/fish-networking-getting-started)

Integrating Unity Relay

Step 1: Install Required Unity Packages

Unity Packages (via Package Manager)

• com.unity.transport
• com.unity.services.relay
• com.unity.services.authentication

Step 2: Authenticate Players

Before hosting/joining, authenticate anonymously:

Step 3: Host a Game

Step 4: Join a Game

Key Scripts for Multiplayer

Networked Player Movement

– Check Relay Dashboard: Monitor allocations in [Unity Gaming Services](https://dashboard.unity3d.com/).
– Logs: Debug with `Debug.Log` or `NetworkManager.Logging`.

Performance Tips

– **Optimize Bandwidth**: Use `[Networked]` sparingly.
– **Lag Compensation**: Implement client-side prediction if needed.
– **Scale with Relay**: Upgrade for more CCUs (concurrent users).

Synchronized Fish Net (Server Authority)

Testing & Debugging

– Use ParrelSync: Test multiplayer in the editor with cloned instances.