MekDefender
by vicuna
MekDefender keeps Mekanism machines and networks under owner-aware control on NeoForge servers running Minecraft 1.21.1.
What it does
Machines placed by a player are tied to that owner, and the mod decides which of them may keep chunks loaded. When an owner logs out, loader tickets are released once a configured grace period has passed. Login recovery is throttled so that many returning players do not stall the server at once, and ownerless loaders are disabled by default.
Synchronization between server and clients is bounded. Replaceable absolute-state channels are coalesced, while screens, containers, configuration, security, equipment, player data, transporter and vanilla packets pass through unchanged. Byte budgets learn the real size of server-to-client packets from Minecraft's encoder, so an initial estimate is used only until actual samples arrive.
The mod is server-side only, so players join without installing anything. It requires Mekanism and is released under the MIT License as open source. Files exist for 1.21.1 only, and the latest NeoForge build is 1.2.0, published 2026-07-27.
Key features
Owner-aware chunk loading
Loader tickets are granted and removed according to the owner's presence, grace period and configured policy.
Dimensional Stabilizer handling
An ownerless or offline Dimensional Stabilizer skips its energy drain, so unattended machines do not run out.
Bounded state synchronization
Only replaceable absolute-state channels are coalesced, and mixed bundles pass through unchanged.
Isolated saved cache
Loader positions are stored in a separate file under the world data folder, and removing the mod restores normal Mekanism behavior.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
Use cases
Who it’s for: Server administrators running Mekanism on NeoForge 1.21.1 who want chunk loading and synchronization limited by configuration.
Questions
Does MekDefender require Mekanism?
Do players need to install MekDefender?
Is there a version for other loaders?
What happens to loaders when an owner logs out?
In the catalog
MekDefender is one of 8,016 Management mods on ModsFinder, and one of 2,689 Management mods for NeoForge. 32,366 mods support Minecraft 1.21.1.
More from vicuna
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What the author says
When an owner logs out, Mekanism releases their loader tickets immediately or after the configured grace period. Login recovery is throttled. An ownerless loader is disabled by default; an ownerless/offline Dimensional Stabilizer also skips its energy drain. MekDefender does not own a ticket controller or a Mekanism…
Official listing
- Modrinth page
- modrinth.com/mod/mekdefender
- Owner
- vicuna
- Published
- 2026-07-27
- Updated on Modrinth
- 2026-07-27
- Facts verified
- 2026-10-15