I have AT&T U-Verse, which provides a 2-wire 3800HGV-B Gateway. This gateway connects over cat5 to my PC, PS3, dvr (1st tv), and set-top-box (2nd tv). It also connects wirelessly to my roommates laptop. Last week, a rogue device showed up on the network (one whose name and MAC address I did not recognize). It was showing up as an "ethernet" device, yet didn't effect the total count of the "local ethernet devices." I reset the device list on the gateway (reassigning DHCP addresses) and the device went away, but came back a few days later.
The device was continually being displayed as active, so I tried to isolate it by turning off the wireless on the gateway and then unplugging ethernet wires one at a time. I got down to just my PC and the device was still there, so I unplugged every device that I could on my PC and still the device persisted. I believe this means that the device is being shown as active in the gateway's network list even when it isn't.
I cleared the device list again and borrowed my roommates laptop the next day to try to duplicate the rogue device appearing. I had her use her remote desktop connection to work, her VPN connection, her Bluetooth PDA, and wired iPod, but nothing showed up on the network. At that point I let it go and nothing else has shown up until today, when a new rouge device (different name and different MAC address) showed up. I asked her if she had been using VPN, remote desktop or anything and she said "no" but that she did get a new external hard drive. Now, I could see external storage showing up on the network, but I doubt it would be with the name "clxbdh-dualcore".
I'm about out of ideas as to what to try now. I'm wondering if someone could somehow be wirelessly connecting directly to her Macbook and showing up on the network that way. Does anyone have any ideas?
The device was continually being displayed as active, so I tried to isolate it by turning off the wireless on the gateway and then unplugging ethernet wires one at a time. I got down to just my PC and the device was still there, so I unplugged every device that I could on my PC and still the device persisted. I believe this means that the device is being shown as active in the gateway's network list even when it isn't.
I cleared the device list again and borrowed my roommates laptop the next day to try to duplicate the rogue device appearing. I had her use her remote desktop connection to work, her VPN connection, her Bluetooth PDA, and wired iPod, but nothing showed up on the network. At that point I let it go and nothing else has shown up until today, when a new rouge device (different name and different MAC address) showed up. I asked her if she had been using VPN, remote desktop or anything and she said "no" but that she did get a new external hard drive. Now, I could see external storage showing up on the network, but I doubt it would be with the name "clxbdh-dualcore".
I'm about out of ideas as to what to try now. I'm wondering if someone could somehow be wirelessly connecting directly to her Macbook and showing up on the network that way. Does anyone have any ideas?