DoS or DDos attacks prevention

my server has been continuously attacked my Dos and DDos attacks that is why my hosting company(Hostcentric) saying. and that is making them shutdown my system again and again..

I do not have much knowledge about these attacks so kindly help me how to prevent these.
How do I find what sort of attacks are these and what firewall should I install to get rid of them..

Here is what server ppl told me::
>Outbound UDP FLood from D9024 I have unplugged D9024 from the network. It will stay off until 8pm tonight. Here is a sample of the flood that was occuring. (It came from a high, unpriveleged port).
>
>00:40:F4:4E:99:C2 -> 00:00:0C:07:AC:00 209.25.178.53 -> 213.149.239.197 udp 35349 -> 16634 92 (736bps 0%)
>00:40:F4:4E:99:C2 -> 00:00:0C:07:AC:00 209.25.178.53 -> 213.149.239.197 udp 35349 -> 34124 92 (736bps 0%)
>00:40:F4:4E:99:C2 -> 00:00:0C:07:AC:00 209.25.178.53 -> 213.149.239.197 udp 35349 -> 46797 92 (736bps 0%)
>00:40:F4:4E:99:C2 -> 00:00:0C:07:AC:00 209.25.178.53 -> 213.149.239.197 udp 35349 -> 61447 92 (736bps 0%)
>00:40:F4:4E:99:C2 -> 00:00:0C:07:AC:00 209.25.178.53 -> 213.149.239.197 udp 35349 -> 25606 92 (736bps 0%)
>00:40:F4:4E:99:C2 -> 00:00:0C:07:AC:00 209.25.178.53 -> 213.149.239.197 udp 35349 -> 48586 92 (736bps 0%)
>00:40:F4:4E:99:C2 -> 00:00:0C:07:AC:00 209.25.178.53 -> 213.149.239.197 udp 35349 -> 13605 46 (368bps 0%)
>00:40:F4:4E:99:C2 -> 00:00:0C:07:AC:00 209.25.178.53 -> 213.149.239.197 udp 35349 -> 24248 46 (368bps 0%)
>00:40:F4:4E:99:C2 -> 00:00:0C:07:AC:00 209.25.178.53 -> 213.149.239.197 udp 35349 -> 62153 46 (368bps 0%)
>00:40:F4:4E:99:C2 -> 00:00:0C:07:AC:00 209.25.178.53 -> 213.149.239.197 udp 35349 -> 8577 46 (368bps 0%)
>00:40:F4:4E:99:C2 -> 00:00:0C:07:AC:00 209.25.178.53 -> 213.149.239.197 udp 35349 -> 45818 46 (368bps 0%)
>00:40:F4:4E:99:C2 -> 00:00:0C:07:AC:00 209.25.178.53 -> 213.149.239.197 udp 35349 -> 6461 46 (368bps 0%)


Please help me figure out from which port these attacks are arising..
and hot to preven them

 

 

 

 

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