Please note that this is not an issue that is connected to a single device. It can happen with any device which is capable of connecting in multiple ways.
There are three ways to connect to the internet in my configuration:
1. My computers connect via RJ45 wiring directly - ethernet proper
2. The Technicolor Modem has 5ghz and 2.4ghz (separate) bands (call them A and
3. I have, in addition, an additional add-on WiFi system which is plugged into an eithernet port; that system also has 5ghz and 2.4ghz bands and is capable ot the same speeds as those offered by the Technicolor modem. (call these two bands C and D)
So a device can connect to Ethernet, or any of the A, B , C or D WiFi bands. This configuration has some issues that i would like to solve, but it works for me. Since my house wired for Ethernet RJ45, the C and D bands are on the other side of the house from the A and B bands solving a problem I had with dropped connections from some smart devices.
Here are some of the complicating issues.
1. The C and D bands are not capable of the same level of security as the A and B bands. I only installed them after having serious issues with multiple Comcast solutions of extending WiFi coverage. Comcast solutions were difficutl to control, and reduced the internete speed by a factor of about 4.
2. The Technicolor modem from comcast does not recognize the C an D bands as WiFi nor can it see the bands. So a device that connects to C or D WiFi is reported as an "Ethernet" connection by XFi, the Comcast Online system, and the local cable modem menus. The device knows it's connected to C or D WiFi but your system records the connection as "Ethernet".
Please see my private communication.
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I have encountered the following persistent issues with multiple Comcast cable modems. Is it just me?
1. Some of my devices which connect over WiFi are reported as disconnected even when it can be demonstrated that they are connected.
2. Some advanced security features work after first setup for a while - but as soon as an unknown sufficient number of changes are made in the settings for those features, they stop working, refusing to allow authorized devices to connect, and the only way to fix those features appears to be to replace the Cable Modem.
3. XFi doesn't help, since it seems to agree with the false information on the Cable Modem on everything.
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