Bell DSL went out at 5:30 am this morning at $home, and after several modem cold-restarts (even a 15-minute shut-down) I was getting nowhere. Web interface was saying "PPPoe LCP negotiation fail" - had never seen that before.
Drove a short distance to $Dayjob - and DSL (ISP = TekSavvy) is also out there (?!). Called TS tech support, did 15-minute HPR (hard port reset) and it didn't help. Tech did confirm several up-and-down episodes on the modem happening between 3 and 5 am. During the call, PPPoE must have authenticated because I'm now back on line (here at $dayjob) and can type in this post.
No explanation from Bell. I theorize it has something to do with the world ice skating championships being held here this week...