Strange ethernet behavior on new gateway
Old: DSL with 4 ethernet-attached devices, all working fine. New: Pace 5268AC gateway. Plugged in the same 4 devices - two worked and two failed. Both of the failed devices say "Network cable unplugged." They fail in different ways.
- HP desktop w/Win 7 and a Realtek PCIe GBE Family Controller LAN adapter - no LAN adapter activity lights at PC or at gateway, and of course no internet.
- IBM laptop w/Win/XP and a Broadcom Net Xtreme Fast Internet LAN adapter - plenty of LAN adapter activity lights at PC and at gateway, but it too firmly insists cable is unplugged. Yet, it does provide internet!
One of the devices that is working normally is an Acer desktop w/Win 8 and exactly the same LAN adapter as the failed HP. Also plugged in a Brother printer and a Sony smart TV, and both of those worked OK too.
Have tried attaching the failing devices directly via long Ethernet patch cord (just to prove no problem with internal cable runs) - no luck. Have tried switching the ports around at the gateway; the problem moves with the port.
Device Manager for both failed devices says LAN adapter working properly. HP desktop is fully up to date on system updates.
Bad gateway? Any suggestions of what I could check?