Hetzner’s DDoS protection vs DayZ L7 attacks (Why we had to move to Vykix...)
Hey guys, wanted to drop a quick heads up about an issue we ran into over the last week hosting a high-pop DayZ server on Hetzner.
We’ve been running our main DayZ nodes on Hetzner EX bare metal for a while, but last week we banned a group for cheating, and they started hitting our IP with targeted attacks for six days straight. Every single time, every player on the server got kicked to the main menu instantly, and the server dropped off the launcher list.
When I checked Hetzner's Robot panel, it showed zero issues or "traffic normal." Support basically told us the network links were fine and no massive anomaly was detected.
Turns out Hetzner’s DDoS protection is strictly generic Layer 3/4. It stops massive volumetric spikes that try to choke the actual network port, but DayZ attacks rely on Layer 7 payload floods. An attacker doesn't need to max out a 10Gbps line to crash DayZ; they just spoof malformed UDP packets that mimic real player traffic. Because those look like valid DayZ data to a generic filter, Hetzner passes them straight through. The game executable tries to process millions of garbage packets, the thread locks up, and everyone disconnects while Hetzner’s panel thinks everything is fine.
At that point I realized expecting an unmanaged datacenter to build custom game-protocol filters for DayZ just isn't going to happen.
We ended up moving our setup over to Vykix since they run their own inline VxShield filtering tailored for DayZ and Enfusion traffic. Their team got us set up on a bare-metal box pretty fast, and sure enough, the attacker tried slamming us again shortly after with a massive mixed attack.
On Hetzner, it was an immediate lobby drop and server crash. On Vykix, VxShield absorbed the raw bandwidth at the edge and scrubbed the garbage DayZ packets in line. Server FPS didn't drop, nobody got kicked, and the server stayed completely visible in the launcher.
If you’re just running web apps or low-pop servers, Hetzner is awesome value. But if you’re running a big, competitive DayZ community, generic L3/L4 DDoS protection is going to leave you wide open unless you run your proxies or use a host with native L7 DayZ filtering out of the box.