I believe the architecture of cable modem is that you and your neighbors are on the same coax "loop" so bandwidth is shared. What your neighbors are doing may impact the bandwidth you realize. I am not talking about sharing your WiFI. I doubt that there was anyone piggybacking off of your WiFi since the WiFi range is limited. Do you live in a CYV? If so, it is more likely it could happen. Ask them. If you are in a single family home I am not sure the WiFi range is enough for people in another house to see your WiFi. If you find out for sure that someone is piggybacking off of your WiFi please post as I am curious what sort of WiFi range your router provides. Thanks.
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Originally Posted by TrudyM
Comcast has turned the modem in your home into a mobile hotspot for their other customers use. Now it is a separate line so they can't see what you are doing but they are using your bandwidth and electricity. I have noticed that my internet access in the rental I am at slows way down at certain times of the day. Called Comcast and the guy said others on the public side of the modem were using it . Mystery solved other people are logging in and gobbling up the bandwidth.
HOW TO SOLVE
You can log into your account at Comcast Then click Users & Preferences-->Service Address, which will have your address. Underneath your address click Manage Xfinity WiFi, and then click Disable Xfinity Wifi Home Hotspot. After that, click Save. Now if you see xfinitywifi show up again on your available connections it means that Comcast sent out an update and it turned it back on. Go to Comcast login and turn it off again. Sorry to say I can't do that because I don't have access as I am in a rental but maybe the info will help others.
I don't mind being neighborly but sharing my connections so I can't get on is not acceptable.
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