Rust Server DDOS Protection

[HalynV]

Hello.
Please help in one question.
There is a server (not a game tariff) on which the server for the Rust game stands.
How can I configure the firewall to mitigate DDOS attacks on the UDP protocol on port 10001?
Attacks are constantly coming to him (a notification comes that the server is attacked), but the firewall does not help. The load goes at 125 mb / s. On the server, terrible lags begin.