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And what would you do if a site had high volume and the real time visits can't be distinguished easily between internal and external traffic?

I know I'm playing a bit of the devil's advocate but I do have both situations.

Thanks for your response thus far.

Thanks Francisco

However, I am unsure how using a proxy tests that my internal traffic is being properly filtered from GA....

Thanks Peter, my understanding is Real Time doesn't obey filters so I ruled that out... Can you confirm?

(I hope I haven't missed something simple

I have add IP exclusion filters in Google Analytics. What I haven't been able to determine is how to test to see if it is working. I'd imagine there would be a dip in traffic but if a site is low volume it might not even register.

Thanks!