gcan - 10:37 am on May 15, 2010 (gmt 0)
Thank you very much for your very informative answers.
One more strange thing which I have noticed... My data center's website is never slow. My server and data center's own web server are in the same IP address range, but tracerout results are different.
And one more time - my server is not overloaded. When problems happen all servers in this DC are hardly accessible except the data centers own web server.