My CS 1.6 server is currently being hit by repeated large DDoS attacks (up to ~180 Gbps). OVH mitigation is active, but players sometimes experience lag or temporary disconnects during attacks.

We also have an issue where some players cannot connect directly to the server IP:27015, getting stuck on “Connecting…”, while they can connect normally through a proxy IP.
In the last 24 hours alone:

25 attacks detected
3.55 Tb of traffic cleaned
521.01 M packets rejected

Has anyone experienced this with reHLDS/GoldSrc + OVH Game DDoS Protection/Game Firewall? Any advice on preventing the connection issue or improving mitigation fixing lag would be appreciated.
My server : https://www.gametracker.com/server_info/zm.ultimatex.pro:27015/

never mind fixed by myself