What is XDP?
eXpress Data Path (XDP) is a Linux kernel technology that processes network packets at the earliest possible point — directly in the network driver, before they even reach the kernel's networking stack.
Traditional firewalls (like iptables) process packets after they've been through the kernel. XDP bypasses this entirely, enabling packet decisions in microseconds.
Why XDP Matters for Game Servers
FiveM servers communicate via UDP — a protocol that's fast but easy to abuse. Attackers can flood a server with millions of fake UDP packets per second.
With XDP, our proxy instances can:
- Inspect every packet at line rate (millions per second)
- Drop malicious traffic before it consumes any CPU or memory
- Forward clean packets with near-zero added latency
The result: your players experience sub-millisecond overhead while attacks are absorbed silently.
How It Works at fiveshield
When a player connects to your FiveM server through the fiveshield anti-DDoS proxy:
- Their UDP traffic arrives at one of our 9+ proxy locations
- The XDP program attached to the NIC examines each packet
- Per-IP rate limiting and SYN flood protection filter malicious traffic
- Only traffic from whitelisted players on active ports is forwarded
Combined with our custom nftables rules for deeper inspection — including player whitelist validation and connection tracking — this creates a defense-in-depth approach that handles both volumetric and protocol-level attacks.
Performance Impact
Because XDP operates at the driver level:
- Same-location latency: < 0.5ms added
- Packet processing: millions of packets/second per core
- Zero kernel overhead: no context switches, no socket buffers
Your players won't notice any difference — except that the server stays online.
The Bigger Picture
XDP is just one layer of our defense. Combined with L7 CDN caching, dynamic player assignment, and multi-point redundancy across 9+ locations, fiveshield delivers comprehensive multi-layer protection for FiveM and RedM servers.
Ready to see it in action? Follow the 5-minute install guide to get your server protected today.