what is eating up my centos VPS bandwidth

Hi experts
I have  a VPS that running CentOS 5.4 32 bit .. kloxo  control panel .. got only one site with very few traffic .
I was using that VPS for more than 2 years  with no problem
this month I got this message  from SolusVM Admin
 
"We are sending you this email because you have exceeded  more than 90% of your bandwidth allocation on the virtual server listed below:"


Based on kloxo my usage still very little ,, but SolusVM  has different say .

What I want :- a step by step solution to identify what could be eating my bandwidth and how to stop it .. ( I'm afraid my VPS could be hacked ... )
Many thanks
LVL 10
honestman31Asked:
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honestman31Connect With a Mentor Author Commented:
just now i know the reason ,
my VPS got suspended and i got this message

"DNS Servers on your network are being used in DNS Amplification Attack's Worldwide."

So it is
DNS Amplification Attack's

Thanks for trying to help
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Zephyr ICTCloud ArchitectCommented:
Hi...

Do you have "iftop" installed, or can you install it on your VPS?

This will allow you to monitor what is eating your bandwidth

either as root, or a user with the necessary rights run:

iftop

Open in new window


Or with a filter:

iftop -f icmp

Open in new window


This way you get to see if some process or program is connecting somewhere that shouldn't.

Besides that, check all your logs for any irregularities ... Things that shouldn't be there.

- Check for failed logins in /var/log/messages
- Are there any new and unknown users created?
- When you use "top" are there any processes that you don't recognise?
- Check if any new programs were installed (rpm -Va).
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honestman31Author Commented:
Hi spravtek,
iftop  not installed ,,
tried yum install iftop  but did not work  ,, ( how to install it )

attached is what I see when use top ..
top.jpg
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honestman31Author Commented:
was a DNS Amplification Attack's
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