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 Before I was using an outdated model and never seen this happen.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?