[ish12321]

Originally Posted by joropito If the attack don't overload your connection but affects your HLDS stability, you could try filtering using iptables. As I see your capture, they're using more than 5k bots doing A2S_INFO attack. Best thing you can try is to rate-limit A2S_INFO packets to avoid high cpu usage on your hlds. Any action you may take on the server could not stop nor avoid connection overload.

Query caching could help as per my knowledge.