Preventing DOS attack on Ubuntu gaming server

A friend is running Jedi Knights - Jedi Academy on an Ubuntu server. The gaming server seems to occasionally get slammed by a DOS attack and the causes problems for all the gamers. What are some methods that could be employed on the server itself to prevent the DOS attacks from interfering with the game? And what kind of logging on the server might identify the origin of the attacks? Thank you.
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amigan_99Network EngineerAsked:
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serialbandConnect With a Mentor Commented:
Are you even sure it's a DDOS or a DOS attack?  Is the server just getting overloaded?
Check the server load average first with uptime or top.

Check your connections and see if you're being bombarded.
netstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n


http://www.liquidcomm.net/news/tech_tips/linux_os/how-to-manage-a-ddos-or-dos-attempt-directed-at-your-linux-server.html

http://www.linuxsecurity.com/content/view/121960/49/

     
If you are getting bombarded, then limit the connections
http://rockdio.org/ayudatech/how-to-stop-small-ddos-attacks-some-basic-security-advice/
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gheistCommented:
Send 10000 packet pcap file. Theoretizing about and around does not help attacked.
Most DOS attacks nowadays are distributed, and you are unlikely to trace source.
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amigan_99Network EngineerAuthor Commented:
Just what we need. Thank you.
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