@IrvSp Thanks for your help and time. I was able to solve my problem combining a bit of luck and a bit of debugging. My explanation of the solution is listed as an edit on my original post.

I used to have a Netgear router, and since I was paying my ISP for it, I decided to return it and buy my own TP-Link router. Upon installing the new router, I'm having 2 issues that I didn't have...