Best Stresser for FiveM Servers (Testing CitizenFX & UDP DDoS Protection)
FiveM (built on the CitizenFX framework) powers thousands of custom Grand Theft Auto V multiplayer roleplay communities. Unlike traditional web applications that communicate over TCP HTTP/S, FiveM servers rely heavily on UDP on ports 30120 and 30110 for game state synchronization, voice chat (Mumble/pma-voice), and player heartbeats.
FiveM Network Vulnerabilities Under Attack
When stress testing a FiveM server node, auditors evaluate resilience against these specific vectors:
- CitizenFX GetEndpoints / Info Floods: Querying server info repeatedly via HTTP/UDP to max out backend thread pools.
- Mumble Voice Channel UDP Exhaustion: Flooding the voice server port with randomized UDP noise, causing high ping and voice dropouts for all active players.
- OVH VAC & Path.net Filter Bypasses: Randomized UDP payloads designed to evade static game firewall signatures and flood the root CPU.
FiveM Server Protection Comparison
| Anti-DDoS Provider | Scrubbing Method | FiveM Voice Stream Stability |
|---|---|---|
| OVH Game Anti-DDoS (VAC) | Hardware-based protocol validation on port 30120 | Very Stable (< 2s mitigation delay) |
| Path.net Anycast | Real-time BGP Flowspec + Stateless Filtering | Instant mitigation, zero voice lag |
| Standard Cloud VPS (Unprotected) | Generic null-routing after 5 Gbps | Immediate server crash / null-route |
FiveM UDP Network Protocol Architecture
FiveM divides network communications into reliable (TCP-like over UDP) and unreliable (raw fast UDP) channels:
- Game State Sync (Unreliable UDP): Player positions, vehicle coordinates, and shooting telemetry. Missing packets are ignored in favor of newer updates.
- Server Events & RPC (Reliable UDP): Inventory transactions, money transfers, and spawn events. These require acknowledgment frames and will stall if the connection drops.
OVH VAC Gaming Filter Custom Rule Tuning
In your OVHcloud Manager dashboard under Dedicated Servers > Network Security > Anti-DDoS Game, ensure the following profile options are activated for FiveM port 30120:
- Game Profile: GTA V / FiveM CitizenFX
- Mitigation Mode: Permanent (Avoids 2-second mitigation engagement delay)
- Voice Sync Port (30110): Rate-limit to 250 packets/sec per client IP
Frequently Asked Questions (FAQ)
How do I test if my FiveM server is protected by OVH Game VAC?
Launch a 30-second UDP-BYPASS test on port 30120 using Boota. Check your OVH Manager dashboard under "Network Security" to verify that VAC mitigation automatically engaged within 2 seconds.
Can Cloudflare protect a FiveM server?
Cloudflare Free/Pro/Biz plans only proxy HTTP/S traffic. To protect UDP game traffic on port 30120, you must use Cloudflare Spectrum or Cloudflare Magic Transit, which require enterprise contracts.
What is the best hosting provider for FiveM servers in 2026?
Dedicated bare-metal servers on OVH Game or hosts utilizing Path.net Anycast routing offer the best out-of-the-box UDP filtering for CitizenFX.
Summary
Ensure your FiveM roleplay community stays lag-free. Validate your hosting provider's anti-DDoS shields with Boota today.