I plugged my Windows 10 laptop into a router from our new isp. We only got the fibre, no services set up yet (The fibre can carry phones, tv and internet)
Immediately when I plugged the cable in, the browser opened and showed "Welcome to your fiber connection from X-corp. Call us at 555-555-5555 for to get internet" (Name changed ;-)
How does that work? Note, I wasn't trying to go to a website and got redirected, no, the browser started "magically".
Can windows get a command over dhcp?
I can see some use for this "autostart" on our corporate network, yet I fear black-hat use of this.