Emergency: Who is Eating my Server Bandwidth?

I run a shared Web hosting server running Red Hat Linux.

Since the past three days myoutgoing bandwidth usage has shot up from 3GB / day to
20GB/day.

How can i trace who/what is eating all my bandwidth? I have a number of websites hosted on this server. I do not have any control panel like Cpanel or anything else.

How do i figure out what is takign all my bandwidth?

 

 

 

 

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