MAC address is FF-FF-FF-FF-FF-FF, accept packet is 0, LAN computer cannot access the network solution

My colleague's computer suddenly had a blue screen, and he could not start the computer after changing it. It was not long before he was able to get online after one click!
Because we use routers to share the Internet access in the LAN, ip addresses are automatically obtained by default. If I suspect that ip addresses cannot be obtained automatically, I need to manually enter ip addresses, default gateways, and other data! In an episode, I found that its Mac address was F last night. I was a bit skeptical, but I didn't care about it at the time. It took two nights to solve the problem that I couldn't access the internet! My colleagues are still boasting: computer experts are sure to be able to handle the problem. I am very lucky!
It is found that the accept packet in the panel of the network neighbor is 0, but the packet sent is large!
Ping 127.0.0.1 indicates that the network adapter is correct.
The IP address entered by ping indicates that the NIC Driver is normal.
Ping the gateway result request timeout. Check the network cable, crystal head, or switch according to the instructions on the Internet. The problem persists!

I think the Mac address is F. google it! I found the solution below, and the description also proves my idea.
 
Solution for MAC address all for FF-FF-FF-FF-FF-FF1. Modify the Registry (more complex) 2. follow the steps below (relatively simple)
"Right-click the" Network Neighbor "icon on the desktop and select" properties ". In the displayed" network connection "dialog box, right-click the" local connection "icon, select "properties". A "Local
In the Connection Properties dialog box, click "Configure", select "advanced", and select "Network Address" in the "properties" column on the left (in fact, not all Network cards, physical address description
"Network Address" is used, for example, Intel's Network adapter uses "Locally Administered Address" to describe, as long as it is in the right column box
You can find the "value" option.) then, select the single option above the "value" option in the right column (not "nonexistent "), in this case, enter the MAC address of the NIC in the right box, as shown in figure
"000B6AF6F4F9 ". Click "OK" to complete the modification. "

Don't forget to restart your computer!

OK. I am also very fulfilled when I see that he can access the Internet!