Modify the MAC address of the NIC in SnowLeopard, Ubuntu, and Windows

I recently bought a USB cable NIC (AX88772 chip) for SnowLeopard. the MAC address of each boot will change to 0 (I don't know if it is a problem exclusive to I ), in this way, communication is not allowed even if the IP address is assigned. Therefore, you must modify the MAC address before replying to a power failure. Let's take a look at the current situation first: All 0 addresses 1. Modify MAC under apple and restart Nic 2. Modify MAC under Ubuntu, which is slightly different, write a method first. 3. Modify the MAC in Windows. a usb wired network card (AX88772 chip) was recently purchased for Snow Leopard, the MAC address is changed to 0 (I do not know if it is a problem exclusive to the I nic), so that even the IP address cannot communicate. Therefore, you must modify the MAC address before replying to a power failure.
Let's take a look at the current situation: All 0 addresses


1. Modify the MAC address and restart the NIC under Apple


2. Modify the MAC in Ubuntu. This is slightly different. First, write a method.


3. It's easy to modify the MAC in Windows, and it's all-graphical.