For our cable internet clients we provide a modem that has no router in it. For our DSL clients, we gave up on bridging, and just assign our router a static IP and put it in a DMZ on the DSL modem/router. Too many times the modems were reset either by the client or by the ISP. I do not know how many times I have gone to a job, look at the ISP modem/router and see the wi-fi has been turned back on. Bugs the hell out of me. And when I bring it up, no one knows a thing of course.

Some people, when the internet stops working, are just smart enough to know which box does that, and they also know they should always call the ISP first and follow their instructions to reset the modem. LOL. And yes, this is after the first time they did it, and were charged a service call for us to come sort it out for them, and they were given explicit instructions not to do that again. :)