ViaFabric

Client-side and server-side ViaVersion implementation for Fabric

Allows the connection to/from different Minecraft versions on your Minecraft client/server (LAN worlds too)

This mod can be installed on 1.14.4, 1.15.2, 1.16.5, 1.17.1, 1.18.2, 1.19.4, 1.20.1, 1.20.4, 1.20.6, 1.21 with Fabric Loader.

The legacy branch also supports Legacy Fabric 1.8.9 and 1.12.2 versions.

Dependencies

Dependency	Download
(Bundled) ViaVersion	https://viaversion.com/
(Bundled) Cotton Client Commands (MC 1.14-15)	https://jitpack.io/#TinfoilMC/ClientCommands
Fabric API	https://modrinth.com/mod/fabric-api

Note: ViaVersion is designed for Vanilla Minecraft servers. It probably will not work with modded registry entries or registry synchronization (fabric-registry-sync mod).

ViaVersion

How can I install ViaBackwards/ViaRewind?:

• Just drop them into mods folder. Make sure you are using versions compatible with the ViaVersion version you are using.

What versions can ViaVersion, ViaBackwards and ViaRewind translate?:

• With ViaVersion: Your server can accept newer versions. Your client can connect to older versions.

• Adding ViaBackwards (and optionally ViaRewind): Your server can accept older versions. Your client can connect to newer versions.

  Note: When using ViaFabric for versions older than 1.17, you need Java 8 builds

• Server-side: See https://viaversion.com/

• Client-side:

	1.8.x	1.9.x	1.10-1.20.x	1.21.x
1.14.4-1.20.6 clients	✓	✓	✓	⟲
1.21 client	✓	✓	✓	✓

✓ = ViaVersion ⟲ = ViaBackwards ⏪ = ViaRewind

Note: 1.7.x is not supported in ViaFabric - 1.9.x, 1.10.x, 1.11.x, and 1.13.x may cause problems when visiting such servers in client-side mode.

Can ViaVersion, ViaBackwards and ViaRewind support snapshots?:

• Check https://ci.viaversion.com/ for development builds with snapshot support

Alternatives

Client-side:

• ClientViaVersion: Discontinued 5zig plugin.
• multiconnect: Discontinued Fabric mod for connecting to older versions: down to 1.11 (stable) and 1.8 (experimental).
• ViaForge: Clientside Implementation of ViaVersion for Forge.
• ViaFabricPlus: Fabric ViaVersion/ViaLegacy/ViaAprilFools/ViaBedrock implementation with client-side fixes.

Server-side:

• ProtocolSupport: Bukkit plugin for older client versions (down to 1.4.7).
• ViaVersion: Plugin for BungeeCord, CraftBukkit, SpongeCommon and Velocity servers.

Standalone proxy:

• DirtMultiversion: Proxy allowing to connect down to Beta 1.3 with newer Minecraft client versions.
• VIAaaS: Standalone ViaVersion proxy with ViaBackwards and ViaRewind, allowing you to connect without a mod installed on your client. Supports online mode.
• ViaProxy: Standalone ViaVersion proxy with ViaBackwards, ViaRewind and ViaLegacy, allowing you to connect to a wide range of versions (down to classic versions) with your modern client (1.7.2+). Supports online mode.

Cool things to try:

• Geyser: Plugins, Fabric mod and a standalone proxy for allowing Bedrock Edition on Java Edition servers.
• PolyMc: Fabric mods which translates modded items and blocks, allowing vanilla to connect using resource packs.

Commands

Commands:

• There're 3 server-side alias /viaversion, /vvfabric and /viaver, and a client-side command /viafabricclient for Minecraft 1.14+ (OP permission level 3 is required for these commands, received by Entity Status Packet)

Configs

Configuration:

• ViaVersion configuration is available at .minecraft/config/viafabric/viaversion.yml
• ViaFabric configuration is at .minecraft/config/viafabric/viafabric.yml

How can I disable client-side ViaFabric?:

• You can disable it in the menu or by setting global protocol version to -1 (this will keep per-server translations still enabled)

How to use protocol detection?:

• For using globally, set the protocol to AUTO or -2. For using in a specific server: ddns.example.com._v-2.viafabric
• The protocol detector will try to ping with the client native protocol version, differently than multiconnect which uses -1 version, which may detect the native server version.

How can I set the version for specific servers?:

• Append ._v(VERSION).viafabric.
• Examples: minigame.example.com._v1_8.viafabric, native.example.com._v-1.viafabric , auto.example.com._v-2.viafabric

ViaFabricPlus

Does it work with ViaFabric:

• No, ViaFabric cannot be used with ViaFabricPlus.

Differences with ViaFabricPlus:

	ViaFabric	ViaFabricPlus
Can be installed on	Multiple client/server versions with fabric	Latest client-side version with fabric
Objectives	Simply implement ViaVersion	Implements ViaVersion with client-side fixes to version changes
How does it work?	Modifying packets at network code	Modifying client code more deeply
Triggering anti-cheats	Very likely	Mostly not

Disclaimer

It cannot be guaranteed that this mod is allowed on specific servers as it can possibly cause problems with anti-cheat plugins.
(USE ONLY WITH CAUTION!)