Connectivity Mod (1.21.1, 1.20.1) is a technical mod designed to address various issues with network connections to a server (or local game), including problems like login timeouts, DecoderException (decoding exceptions), packet size limits, ghost blocks, payload being too large, and others.

Features:

  • Connection fixes:
    • Login timeout
    • Play timeout
    • Fix packet size exceptions during login/play
    • Malformed or malicious traffic protection
  • Network monitoring:
    • Detailed network statistics
    • Log packets that are too large and show their source
    • Warnings for oversized data being sent
  • Debugging tools:
    • Advanced error logging
    • Packet logging
    • Commands to analyze network traffic

Usage Notes:

  • The mod is optional on both client and server sides but offers useful features for both.
  • It is not compatible with Timeoutout/XL packets mod.

Commands for Network Stats:

  • Client-side:
    • /connectivity packetsClient – shows outgoing traffic from the client.
  • Server-side:
    • /connectivity packetsAllPlayers – lists traffic rate of all players.
    • /connectivity packetsPlayer <player> – shows packets sent to a specific player.
    • /connectivity packetsSummary – overview of all packets sent by the server.
    • /connectivity printpacket <PacketType> – logs the largest packet of a type to latest.log.

Additional Info:

  • Traffic statistics are updated every minute and keep up to 5 minutes of history.
  • Most network traffic comes from chunk packets; modded packets rarely exceed these sizes.

Screenshots:

Requires:

Minecraft Forge or Fabric API or Quilt Loader or NeoForge Installer

How to install:

Click the following link to view details: How to Install Mods for Minecraft Java Edition on PC: A Beginner Guide

Connectivity Mod (1.21.1, 1.20.1) Download Links

For Minecraft 1.16.5

Forge Version: Download from Server 1

For Minecraft 1.17.1

Forge Version: Download from Server 1

For Minecraft 1.18.2

Forge Version: Download from Server 1

Fabric Version: Download from Server 1

For Minecraft 1.19

Forge Version: Download from Server 1

Fabric Version: Download from Server 1

For Minecraft 1.19.2, 1.19.1

Forge Version: Download from Server 1

Fabric Version: Download from Server 1

For Minecraft 1.19.3

Forge Version: Download from Server 1 – Download from Server 2

Fabric Version: Download from Server 1 – Download from Server 2

For Minecraft 1.19.4

Forge Version: Download from Server 1 – Download from Server 2

For Minecraft 1.20.1, 1.20

Forge Version: Download from Server 1 – Download from Server 2

Fabric Version: Download from Server 1 – Download from Server 2

For Minecraft 1.20.2

Fabric Version: Download from Server 1 – Download from Server 2

For Minecraft 1.21.1, 1.21

NeoForge Version: Download from Server 1 – Download from Server 2

Fabric Version: Download from Server 1 – Download from Server 2

For Minecraft 1.21.8, 1.21.7, 1.21.6

NeoForge Version: Download from Server 1 – Download from Server 2

Fabric Version: Download from Server 1 – Download from Server 2

For Minecraft 1.21.11, 1.21.10, 1.21.9

NeoForge Version: Download from Server 1 – Download from Server 2

Fabric Version: Download from Server 1 – Download from Server 2

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