Security says an unidentified router joined my network.

Avast "network scan" feature showed me a router joined my "network". All of my computers are separate entities, remote access is not allowed anywhere, and nothing is shared; the only thing that everyone can communicate with is a printer. So aside from maybe stealing bandwidth, I'm not sure what it's about. But to my surprise when I turned off WiFi the unidentified ASUS router did not disappear. So I walked the internet cable out of the house, and up to the pedestal. The pedestal is cracked open, with the wire tags hanging out. This is not unusual, most pedestals are damaged or bent over to some degree, even flattened out entirely.

So I conclude that either I'm clueless, and this is normal, and no kidding I just never noticed the extra router on my network(?!) - like is the other router my ISP? Or that someone mistook me for a zillionaire, and hopes to scrape my passwords so they can get some ROI out of this, unaware that in fact if they took it all they'd only get enough for a couple of to-go medium chocolate mochas.

What makes this crazy is that my router login is > 64 (never-repeating and totally random) characters. Anyone who can crack a pw that long with no repeating characters in it deserves some respect, no matter how long it took. Even if he's working for free.

But seriously has anyone heard of a router joined to your wired home network like that? How? Is it really everyone is like that and it's the ISP or the electric company or something? Like maybe it's the new toaster oven? Just joking, our appliances are anything but smart.

I'm quite interested actually.