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About this mod

This is the official VaultMP page for the Nexus New Vegas. From and the group. Vault-Tec Multiplayer Mod - \"VaultMP\" - is a multi-player mod for the PC versions of Bethesda\'s award-winning role-playing games Fallout 3, Fallout: New Vegas and The Elder Scrolls IV: Oblivion. It\'s currently in development.

Permissions and credits

Welcome to the official VaultMP Nexus page for Fallout new vegas.

Other pages:

Fallout 3 Nexus

Vault-Tec Multiplayer Mod ("VaultMP") is a multiplayer mod for the PC versions of Bethesda's award-winning role-playing games Fallout 3 andFallout: New Vegas. It's currently in development, but is going to support the following:

Dedicated server, MasterServer and client including a server browser
Syncing of movement, actions / animations and AI
In-game GUI overlay for chatting
Supporting DLCs as well as Fallout user mods
Server-side scripting to define gameplay rules
The main goal is to enable players to roam the open worlds of the wastelands and experience all the exciting features of the games online.

What vaultmp is - and what it isn't

Mod is actually not the best fitting keyword in my opinion. VaultMP is supposed to be much more like a framework. It aims for extensibility and scalability. The goal is to provide the tools necessary to create engaging online environments in the Fallout games. It does not impose any limits on what you can do with it (i.e. maximum player count), neither does it has any bias towards any kind of multiplayer game.VaultMP is not a co-op mod, a MMO, or anything else of the like. The community is free (and encouraged) to take VaultMP and develop server-side game modes, composing the actual rules of gameplay. Therefore VaultMP exposes a rich scripting interface, with a C API at its core, as well as native support for C++11 and PAWN scripts.

VaultMP is not:

Co-op, MMO, deathmatch, etc.
VaultMP is:

A framework to create any kind of multiplayer game


Scripting is one of the most important features of Vault-Tec Multiplayer Mod. It grants access to in-game Objects and allows to manipulate them. With the help of scripts, it is possible to customize the game experience and even create whole new gamemodes. Scripts are executed server-side by the dedicated server of vaultmp. Users who code scripts are known asscripters. They mainly use the scripting functions and scripting callbacks (see VaultMP interface) provided by the mod to write a script. A script can be written inC++ or in the PAWN language. See the section Installing a script in the dedicated server setup guide on how to load such a script.

C++ scripting

Scripts can be written in C++. It allows for maximum flexibility and an extremely large set of possibilities. An example script comes with the vaultmp package including project files for Code::Blocks IDE. C++ scripts need to be compiled as dynamic-link library (shared object for Unix) files. The entry point of a C++ script is exec.

Pawn scripting

Scripts can be written in PAWN. With regard to the VaultMP interface, PAWN scripts can be as powerful as C++ ones. An example script comes with the vaultmp package. PAWN scripts need to be compiled with pawncc.exe (comes with vaultmp) and the -C64 command line option appended. The entry point of a PAWN script is main.


Vault-Tec Multiplayer Mod is a rather huge project and I would be grateful if it had some more developers. Work on vaultmp can be exciting and very diverse. It deals with the game engine (low-level), networking code, scripting and various design patterns. Most parts aren't easy to understand so you are required to have some well established C++ knowledge. However, I'm happy to answer any question regarding the source code!
If you are interested, write me a mail ([email protected]). The source code is available here: Github

-Recycler (head core)
-Roby65 (Creator of the GUI and database)


This is a bugfix release ("gary 2.3") which resolves the following issues:
Client crash in Fallout 3 after startup
Client crash in Fallout: New Vegas after respawn

Please update your version. Previous releases will no longer be able to use the master server.

Nice skins for the vaultmp GUI:!

If you are getting world loading errors (or loading screen freezes), please check this thread:

This is a bugfix release ("gary 2.2") which resolves the following issues:
Client crash in New Vegas as soon as a second player joins

New features:
Synchronization of idle animations (like sitting on a bank, drinking water etc.) - experimental

Please update your version. Previous releases will no longer be able to use the master server.

If you are getting world loading errors (or loading screen freezes), please check this thread:

This is a bugfix release ("gary 2.1") which resolves the following issues:

Server crash after respawn
A client crash after a player left the server
Melee weapons not being handled properly
RemoveAllItemsEx startup failure (only experimental)

Please update your version. The "gary 2" release will no longer be able to use the master server.

If you are getting world loading errors, please check this thread:

Fallout: New Vegas is known to crash as soon as a second player joins a server. I hope to be able to fix this quick. Any support is very appreciated.

vaultmp 0.1a snapshot "Gary 2"
Please note that this is just another snapshot on the long road of the 0.1a branch. It is not nearly a final alpha version.

The master server is online and will likely stay online.

Major changes in this release:
vaultmp no longer uses savegames
synchronization of weapons*
synchronization of health and death, respawning
synchronization of item environment**
chat GUI (use T for chat in-game)
revamped and extended scripting interface***

* not including throwable weapons
** does not include static references (the ones already present a priori in-game). still experimental
*** the scripting docs have not yet been updated

Known bugs in this release:
desync of alert state when the player is moving. You have to switch state while you are standing still for it to properly sync
vaultmp may (rather rare) crash after a player leaves the server, or after you close the game (the cause is known and I'm working on it)
weapon aiming / firing may be inaccurate if not in ironsight mode

Q: Can we play lan?
A: Yes you can.

Q: I can play on Fallout 3 servers, but not NV servers?
A: NV is bugged at the moment, only Fallout 3 works.

Q: Theres no servers, whats going on?
A: VaultMP is intended as a frame work for scripters to host custom servers. Our goal isnt to host servers, but to give you the tools to host your own.

Q: It keeps crashing, what should I do?
A: Gary 2 is a very early alpha release being developed almost single handedly by Recycler. This level of instability is to be expected. Report all bugs on the official forums.

Q: Will you support mods?
A: Yes down the road mods will be fully supported. You should be aware that any mods that contain custom geck scripts will need those scripts converted to C\C++ or PAWN to work with VaultMP. Currently, any mods activated in your load order, will be deactivated when you launch VaultMP.

Q: I dont see any Npcs, where is everyone? What about Quests?
A: Npc's and quests are not currently synced, so they have been removed as to not give the impression that they are synced. Both Npc's and quests will eventually be added once there synced.

Q: What about items?
A: All items within containers have been removed from said containers. Any item that was originally placed in the gameworld outside a container will still be there. Lastly, the console is available to use once ingame, allowing you use item codes to give yourself armor/weapons/ammo/stimpacks if you wish. The console will eventually be removed as we move from alpha to beta.

    * The name of the anti cheat system will be Overseer.
    * All the design and website layout is made by Volumed.
    * Rob is a awesome guy.

Disclaimer: I run this page with the permission of the mods author, Recycler. If you have any questions related to the multiplayer which cannot be found in the FAQ, please head over to the official forums. VaultMP is in early alpha stage. You need a decent level of computer knowledge to set it up a server at the moment. It is not released for production, just for testing by experienced users.