Me again>>>followed my footsteps and found some super-helpful info. First, I accessed my gateway from a different computer and was able to stay logged in long enough to lock-down the firewall. Also setup to mail me logs of firewall and alerts when new rules I created, to shut down this 192.168.x.4 location. BINGO! I installed a program, a while ago, on another computer on my network, called FREEPROXY. Was trying to setup a proxy server for various reason, and being frugal (cheap) free looked good and I had recently had good luck with "free networking software" like SANDRA and Spiceworks (Spiceworks is amzing!!!).
Well, FREEPROXY was unistalled some time ago (it didn't work very well-now I know why). It has setup a phony device (identified by Network Magic as a safe, but unknown network device), a virtual address/device that has been broadcasting God only knows what from my computer(s).
Has anyone heard of this program? My advice-steer way clear if you come across it.