Friend of mine just showed me a strange problem he found. His new computer has a gigabit NIC and the NIC works flawless when connected to the router. When plugging in a loopback to the Realtek Gigabit NIC it wont link. When using this same loopback on another NIC on another computer it links with no problem.
He made a new loopback and tested it on the older computer with 100mb NIC and it tested fine and then he inserted it into the Gigabit NIC of the new system and once again no uplink, yet you can connect a network cable to this NIC and it will link and work then.
Anyone know why the loopback doesnt work with this NIC? Is there something different with Gigabit NICs to where loopbacks wont work.
I was thinking that maybe it was an issue with full duplex vs half duplex, but its not configured for full duplex...