From a security standpoint, it’s a good idea to understand the technique, referred to as “MAC spoofing,” because hackers also find it useful to get around MAC address filtering. There are a few reasons you might want to simulate another MAC address, including troubleshooting and testing your network. We’ll see how to do this with Windows, Mac OS X, and Linux. Though you can’t change the permanent MAC address actually stored by the network adapter, you can make it provide a different address using your operating system (OS). Network adapters come preconfigured from the factory with their own globally unique physical or Media Access Control ( MAC) address, which helps them identify themselves when communicating with other networking components.
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