[cortesoft]

Not very quickly? First, you wouldn't know why you were disconnected. You would try the standard things first (plug and unplug your router, etc). Then maybe after a while you would call your ISP. Get put on hold a bunch. Your ISP tech support probably won't know much either, since in your scenario it isn't the ISP doing the blocking. They MIGHT test the connection, or maybe they just give the customer a new IP address.

It is going to take quite a while in this scenario for the user to realize it is their IoT toaster that is causing the issue.