Transitions Captive Portal and Yandex Metrika?

Question

pfSense

Good afternoon!
Who can help in a difficult matter. Is available Pfseense on it the Captive Portal is configured. When the client enters the page for the first time, a browser window opens with the address http://192.168.x.1:8000 , he presses the button to continue working on the Internet and gets to the organization's website.
But the problem in the next Yandex Metrica sees transitions from the address http://192.168.x.1:8000 , how to do it in such a way that, for example, the transitions are from free proxy servers, etc.