ddos attack on port 28960

[Cheetah]

Hey guys, sorry for my english...
Already second time my servers (server.cod-4.ru) under ddos attacks (600mbit). Server are running on linux gentoo and with your linux bin (cod4-linux-server-06282008.tar.bz2). Attacks go to only 28960 port.
Have you any ideas?

Thanks
CoD-4.ru
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