Do not rely on the base game to protect itself. The Garry's Mod developer community has created vital security tools available on GitHub and the Workshop:
Server logs showing a specific player spawning a dupe, immediately followed by Timed Out messages for all players.
Which alternative would you like?
: Spawning massive numbers of props or entities (e.g., 20+ at once) in a single tick, causing a massive lag spike that exceeds the server's processing capacity. gmod server crasher dupe
Restrict the maximum number of props, ragdolls, and effects a player can spawn at one time.
Using illegal constraints (e.g., thousands of welds).
Crasher dupes often succeed because they force the server to process too much data in a single frame. Implementing a cooldown on the Duplicator tool ensures that even if a dupe is large, it cannot be spammed rapidly to force a crash. How to Handle an Active Attack Do not rely on the base game to protect itself
Block players from spawning blocked models or spawning duplicates too quickly.
Never give new or unverified players access to the Duplicator or Advanced Duplicator tools. Restrict these tools to trusted ranks like "Regular," "VIP," or "Admin" using your administration mod (such as ULX or SAM). The Technical Battle: Valve and Facepunch
Utilize anti-spam modules to put strict cooldown timers on the tool gun. : Spawning massive numbers of props or entities (e
The proliferation of crasher dupes poses a severe threat to GMod community servers, particularly in high-stakes gamemodes like DarkRP, Military RP, and Sandbox.
While most dupes are intended for sharing complex buildings or contraptions, crasher dupes exploit the physics engine and entity handling:
Advanced crasher dupes do not just rely on physics; they rely on data. Malicious users modify the text-based .dupe files directly using external text editors. They inject massive strings of corrupted data or force the dupe to call for non-existent assets. When the server tries to read the file and network the data to all connected clients, it suffers a buffer overflow and drops the connection. 4. Wiremod Exploits
Dupes featuring hundreds of entities welded together in overlapping positions. When spawned, the Source Engine's physics simulator (VPhysics) attempts to resolve the collisions simultaneously, causing an instant CPU spike and server timeout.