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 supports 1.8.9 (in mc-1.8 branch), 1.14.x/1.15.x (in mc-1.14-1.15 branch) and 1.16.x/snapshots (in mc-1.16 branch) with Fabric Loader. Check the Minecraft version in file name when downloading from CurseForge/GitHub Releases.

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

1.14+ Dependencies:

Dependency	Download
(Bundled 3.1.0 release) ViaVersion 3.0.2+	https://ci.viaversion.com/job/ViaVersion/ or https://ci.viaversion.com/job/ViaVersion-DEV/
(Bundled) Cotton Client Commands	https://www.curseforge.com/minecraft/mc-mods/cotton-client-commands
(Optional) Fabric Command API v1/v0	https://www.curseforge.com/minecraft/mc-mods/fabric-api
Fabric Resource Loader v0	https://www.curseforge.com/minecraft/mc-mods/fabric-api

1.8.9 Dependencies:

Dependency	Download
(Bundled 3.1.0 release) ViaVersion 3.0.2+	https://ci.viaversion.com/job/ViaVersion/ or https://ci.viaversion.com/job/ViaVersion-DEV/
(Optional) Fabric Commands v0	https://www.curseforge.com/minecraft/mc-mods/legacy-fabric-api
Fabric Resource Loader v0	https://www.curseforge.com/minecraft/mc-mods/legacy-fabric-api

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

How can I install ViaBackwards/ViaRewind?:

• Just drop it into mods folder. Make sure you are using versions compatible with the ViaVersion version you are using. ViaVersion-DEV/ViaBackwards-DEV/ViaRewind-DEV and ViaVersion/ViaBackwards/ViaRewind CI builds are only compatible to each other if they have the same label (-DEV or empty).

What versions can ViaVersion, ViaBackwards and ViaRewind translate?:

• Server-side:

• Client-side:

Your Client	1.8.x	1.9.x	1.10-1.14.4	1.15.x	1.16.x
1.8.9	✓	⏪	⟲	⟲	⟲
1.14.x	✓	✓	✓	⟲	⟲
1.15.x	✓	✓	✓	✓	⟲
1.16.x	✓	✓	✓	✓	✓

✓ = ViaVersion ⟲ = ViaBackwards ⏪ = ViaRewind

Can ViaVersion, ViaBackwards and ViaRewind support snapshots?:

• Check https://ci.viaversion.com/job/ViaVersion-DEV/, https://ci.viaversion.com/job/ViaBackwards-DEV/ and https://ci.viaversion.com/job/ViaRewind-DEV/ for development builds with snapshot support

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)

Configuration:

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

Alternatives to this mod:

• ClientViaVersion: This discontinued client-side plugin for The 5zig Mod implemented ViaVersion, ViaBackwards and ViaRewind for 1.7.10, 1.8.9, 1.12 and 1.12.2 clients, allowing them to connect to 1.7-1.12.2 servers. It also had a protocol translation for 1.7 servers, which there's an updated version at https://github.com/KennyTV/ViaVersion/tree/hack (unsupported).
• multiconnect: This client-side Fabric mod does also accept older protocols and fixes some differences between versions, which ViaFabric doesn't. Currently, it goes down to 1.10. (2020-06-23)
• Protocol4: This LiteLoader client-side mod allows your 1.7.10 client to connect to 1.7.x servers.
• ProtocolSupport: This Bukkit plugin allows clients to connect from older versions (down to 1.4.7).
• ViaVersion: ViaVersion can run as a plugin for BungeeCord, CraftBukkit, SpongeCommon and Velocity servers.

How can I disable client-side ViaFabric?:

• You can disable it by resetting the anti-cheat warning in config file or by setting protocol version to -1

How can I set the version for specific servers?:

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

Does it work with multiconnect at same time on client?:

• Yes, ViaFabric can be used with multiconnect. ViaFabric will send to their version auto detector their closest supported version. (multiconnect beta-supported versions (currently 1.10) aren't used)
• Example of setups:
• (1.8 server) <-> (disabled ViaFabric) <-> (auto detected 1.8 server - multiconnect) = doesn't work because multiconnect doesn't support it
• (1.8 server) <-> (forced 1.8 - ViaFabric - suggests 1.11) <-> (detected 1.11 server - multiconnect) = works, ViaVersion translating 1.8 -> 1.11 and multiconnect accepting 1.11
• (1.8 server) <-> (forced 1.8 - ViaFabric - detected 1.12.2 client) <-> (forced 1.12.2 server - multiconnect) = works, ViaVersion translating 1.8 -> 1.12.2 and multiconnect accepting 1.12.2

WARNING

I cannot guarantee that this mod is allowed on every (or even any) server. This mod may cause problems with anti cheat plugins. USE AT OWN RISK