DNS value changes when tunnel mode is activated

I am recording a mobile app through tunnel mode, at times I can detect the servers but after assigning server to the system and starting recording Neoload does not save any request. Moreover, at times the DNS of the machine gets changed to the system IP, though the reason its bothering is, after the DNS changes the internet of the system stops working.
And when everything works, Neoload does not record any request even when app is working in the device