Have you looked at our NTA product? This seems like the route to go to me
We have NTA and I have tried using IP Address groups for this but all it does is filter the NTA graphs, I cant get the info I require out of it.
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when you drill down to the Interface details view and add Top XX IP Address Groups resource, you'll have amount of bytes transferred by each group in the table below chart
than you'll have to manually calculate percentage for each group from total traffic. Does this have sense for your case?