IP junk - network protection

Good day,

I recently installed a new modem/router TP link W9760 instead of my comcast modem. For the last four days, the private network has not been detected. Instead a public connection is being used. TP link customer service told me that I had IP junks that created the problem.

Is Norton 360 not protecting my network against this problem?

How can I solve this problem with the so-called IP junk?

Best,