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How to detect that mutliples IP addresses point to the same physical server ?

Posted on 2008-10-28
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Last Modified: 2013-11-13
Hi,

When i query the DSN for a MX zone for instance, i get sometimes one MX  record and when i query this MX record to get the A record, i can retrieve up to 10 or more IP addresses.

I dont think that it really exists ONE physical server with 10 network adapters
and i think that these 10 IP addresses point to 2 or 3 physical servers.

I would like to know if there is a possibility to detect that multiples IP addresses point to the same physical server ?

If you can give C# code, hints....
Thank you

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Question by:mars
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Jens Fiederer earned 100 total points
ID: 22826403
This looks an awful like a denial-of-service attack, but it might work:

Since there is logically no way to tell for sure whether two distinct network adapters are plugged into the same server or different servers, you have to take a look at what a single server would have in common - the same set of CPUs for processing.

So request a lot of services from a single IP address, and a more moderate set of services from the other 9, and time the response it takes for those services.

If some addresses show significantly greater degradation in performance than others, those addresses are LIKELY to be shared with the one you are stressing.

But since you probably shouldn't do this to a server without permission - as long as you have to get permission anyway, it is probably better just to ask!
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