SMAC (Software MAC) is a simple GUI utility to list details of your MAC adresses, IPCONCIG information and allow you to change or even spoof MAC Address on the fly. SMAC also has a simple 1-click restart for the network adapters when you need to refresh settings.
The Microsoft Loopback adapter is a testing tool for a virtual network environment where network access is not available. You can bind network clients, protocols, and other network configuration items to the Loopback adapter, and you can install the network adapter driver or network adapter later while retaining the network configuration information. You can also install the Loopback adapter during the unattended installation process.