I use 450G with ether 1 ad 2 for mlpp with Teksavvy

When I lose one line (modem) I lose internet

Most people tell me they only lose on line (speed)

I have used a MT 750G with MLPPP. From my experience I would just lose line speed

I have had upto 4 modems bonded together for testing.

When you are "losing" a line... are you losing sync ? or just testing to see what happens ?

I pull the phone line off the modem to simulate a line failure

I lose internet of the router when I do that.