Is this a kind of attack - 4.4MBits per sec!

I have seen the MRTG graph and it is unbelieveable! For the hour 16 - 18, my server had about 4.4MBits outgoing transfer! Anyone think my server is being attack?

My server use name-based hosting with Analog and ProFTPd, so how can I check the individual log and know who is using up so much bandwidth?

Thanks,

Kevin

 

 

 

 

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