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I am renting a Rackspace cloud instance now and I want to measure the incoming and outgoing bandwidth.

When a normal request comes for a page - what is the bandwidth consumed and when a normal page is delivered to the browser from the server instance .. how much is the bandwidth consumed ?

I want to know more about this calculation.I am a beginner at this. please help

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There are a few different methods to measure bandwidth over time. If you want something graphical and easy to read, you might want to look at ntop:

You can also track bandwidth with iptables pretty easily. You'll just need to set up some ACCEPT rules and then print the iptables rules to see the bandwidth add up. I wrote up a post about this a while back:

If you want to just check a few page loads or look at your instantaneous bandwidth usage, you can also use bwm-ng, iftop, and jnettop.

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thanks that was helpful –  Anand Oct 18 '10 at 19:24
    
Awesome! I'm glad I was able to help a little. –  majorhayden Oct 20 '10 at 3:02
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