Play PSP ad-hoc games over ZeroTier with PPSSPP

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PSP · ZeroTier · PPSSPP

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[ZeroTier](https://www.zerotier.com/) creates a virtual LAN so PPSSPP clients in different places can use PPSSPP's built-in ad-hoc server, as described in PPSSPP's [LAN/VPN guide](https://github.com/hrydgard/ppsspp/wiki/How-to-play-multiplayer-games-with-PPSSPP). This is for PPSSPP. It is not a documented way to put a real PSP onto ZeroTier.

## Set up ZeroTier

1. Create an account and a network at [my.zerotier.com](https://my.zerotier.com/). Copy the 16-character Network ID.
2. Install ZeroTier on every device from the [official download page](https://www.zerotier.com/download/).
3. Join the same Network ID on every device.
4. In the ZeroTier Central dashboard, authorize each member if the network is private.
5. Note the host's ZeroTier-assigned IP from the dashboard or the ZeroTier client. That is the address other players will enter in PPSSPP.

## Configure PPSSPP

These steps follow PPSSPP's [LAN/VPN ad-hoc instructions](https://github.com/hrydgard/ppsspp/wiki/How-to-play-multiplayer-games-with-PPSSPP). Use the same PPSSPP version on every device when you can.

1. Open **Settings > Networking** and enable **Enable Networking/WLAN**.
2. Disable **Try to use server-provided packet relay** on every player.
3. Disable **Enable UPnP** on every player (you do not need port forwarding on a virtual LAN).
4. Set **Port offset** to the same value on every player. If you are unsure, use `10000`.
5. On the host only: open the PRO ad-hoc server address option, use **Toggle List** to find your *VPN* IP (not your normal LAN IP), and enable **Enable built-in PRO ad hoc server**. Then start the game and host or wait in the lobby until you see "Network Initialized".
6. On everyone else: set the PRO ad-hoc server address to the host's VPN IP, keep the built-in ad-hoc server disabled, and join the host's game. Do not type leading zeros in the IP (use `192.168.1.1`, not `192.168.001.001`).

Do not use `localhost` as the server address when players are on different devices.

Source for the PPSSPP steps: [How to play multiplayer games with PPSSPP](https://github.com/hrydgard/ppsspp/wiki/How-to-play-multiplayer-games-with-PPSSPP).

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