Solved! Unknown Ethernet Connection

[ace3366]

I have a technicolor cgm4140com that comcast gave me to connect to the internet. Everything has been working fine for the most part but when i logged into 10.0.0.1 to manage my router which I do every day I noticed in offline devices I have 3 devices that say they were connected by ethernet and only have mac addresses. Well one used to have a ipv6 adress which I traced back to comcast themselves if I did it right but now when I look it only has a mac address. These devices didn't show up all at once either. It was one by one every other day. All different mac addresses that I know arent mine. I never connect through ethernet either, all wireless. I've never seen these devices connected either which might explain having no ip address maybe? Only in a offline state. When I looked up the mac addresses, 2 were Hewlett Packards and one was a Dell so it claims. I'm at a loss on what's going on. I'm worried my data and information that I'm sending out and secuirty history I have might be comprised. I've had this router for about 2 weeks. Before I was using an outdated model and never seen this happen. Ever. Can anyone help me shed any light on this?

 

[Ralston18]

Did you change the router's login name and password?

For the most part you should not need to or be logging into the router almost everyday to manage it. What is driving the need to do so?

Does anyone else have access to the router?

 

[ace3366]

Did you change the router's login name and password?

For the most part you should not need to or be logging into the router almost everyday to manage it. What is driving the need to do so?

Does anyone else have access to the router?

I've always been a paranoid person so the drive is honestly just peace of mind. I've had my email and various accounts hacked before along with my mothers. Not often but enough to not help with my paranoia. Things like these unknown devices I seen just give myself more proof that what I'm doing is valid. And yes I did change the routers password so that only I know it. I changed it again just 5 minutes ago to be sure. I also changed my wifi password just to be safe and see if that might solve the issue. My mother and aunt both live with me and we all have different devices but they don't even know what ethernet is and after speaking with them I know they never hooked anything by that method either. I've wondered if maybe these are devices logging into my xfinity hotspot that I never disabled and my router is somehow logging it as a connection. Doesn't explain why it says ethernet connected though.

 

[Ralston18]

It could be the hotspot offered by Comcast/Xfinity.

Find the User Guide Manual for the cgm4140.

May be available here:

https/www.xfinity.com/support/articles/usermanuals

You may or may not be able to disable the "hot spot" feature of wireless modem.

The following links may be helpful:

https/www.xfinity.com/support/articles/disable-xfinity-wifi-home-hotspot

https/www.itworld.com/article/2858142/mobile-wireless/dont-want-your-comcast-router-to-be-a-public-hotspot-heres-how-to-stop-it.html

Another option that may be available through the router is to "white list" your family's devices via the device MAC's.

Limit the range of available DHCP IP addresses to just one or two more than the number of devices used by you and your family.