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Somehow and magically, as of this AM, my former speeds have re-establiashed themsleves and all appears well for now. Will continue to monitor this issue on a more frequent basis to see if problem replicates itself.
While quite pleased with seeing this issue resolved, I am not at all pleased to see the shades of Senator McCarthy and Roy Cohn show up in this otherwise reliable and productive forum.
One easy way to do it is that if you truly do have two public IP addresses assigned to your connection, you can put the 3939 in to bridge mode so that it acts only as a plain vanilla / straight cable modem. You can then hang your ethernet switch off of port number one on the 3939. Two of the ports on your switch will then yield the two public IP's.
Disconnect the R6400 from the 3008. Power off the 3008. Power on the R6400. When it is fully booted up, press the recessed reset button on the R6400 for 30 seconds. Let it fully boot up again then connect its WAN port to the port on the 3008. Power on the 3008 at let it fully boot up. Any internet ? If not, with the 3008 left powered on, re-boot the R6400 once again. Anything ?
There really is no other "meaning" for that light being out. Perhaps it or its driver circuit is malfunctioning ? Or there is a firmware glitch ? If you are renting it, and are concerned, get it swapped at your local Comcast office.
Yeah, once logged in with your account ID and password it will be remembered. You can manage / remove devices here:
Obviously you would need to change the account ID / password if your son knows that. One other thing, xfinitywifi used to allow at least one free hour per month access to non - account holders, before they have to buy a pass. Not sure if that is still the case, (or how that works), but you can check into it