XXL Packets Mod Wiki
XXL Packets Mod Wiki & Guide
wiki.9minecraft.net/xxl-packets-mod/
XXL Packets Mod is a fork of XL Packets Mod which raises the packet size limit from 2MB to the Java Integer limit (2.147483647 GB). It fixes bug MC-185901 (Impossible to join a server with too many recipes) by raising the packet size limit from 2MB to 2.14GB (2147483647), so that servers with large
Guides
Step-by-step, in-game.
Diagnosing Whether XXL Packets Is Actually Needed on Your SetupSigns You Need It The clearest symptom is a disconnect during the joining/loading screen with a message referencing…How to Fix 'Packet Too Large' Kicks When Joining a Modded ServerWhy You're Getting Kicked When a server sends a packet larger than the vanilla limit, your client disconnects with a…Setting Up XXL Packets on a Server So All Clients Can JoinServer-Side Requirement The mod must be installed on the server, but it is not enough on its own. Every client that…Using XXL Packets with Large Datapacks and Recipe-Heavy ModpacksThe Recipe Sync Problem Servers with many recipes — from large datapacks, extensive modpacks, or custom crafting…
Frequently asked questions
Do I need XXL Packets on both the client and the server?
Yes. The mod must be installed on the server and on every client that connects, since the client is the side that rejects oversized packets. If a client joins without it, they can still get kicked even though the server has it.
How do I know if XXL Packets is actually doing anything?
Check your log for the packet size limit being raised, or try joining a server that previously kicked you with a 'packet too large' error. If the kick stops and you connect normally, the mod is working.
Will XXL Packets fix the 'Packet Too Large' kick on servers with big datapacks?
Yes, that is exactly what it is for. It raises the packet size limit so recipe-heavy modpacks and large datapacks no longer exceed the vanilla cap and kick the client.
Does XXL Packets need to be installed on the client only, or the server only?
Both. The server sends the oversized packets, but the client is what enforces the limit and disconnects, so each connecting client needs the mod as well.