MAC address spoofing is enabled by default for all network interfaces.
This is usually beneficial, even if you don't want to hide your geographical location. Using your own computer on an public network without registration , for example a free Wi-Fi service in a restaurant where you don't need to register with your identity. In this case, MAC address spoofing hides the fact that your computer is connected to this network. Using your own computer on a network that you use frequently , for example at a friend's place, at work, at university, etc.
You already have a strong relationship with this place but MAC address spoofing hides the fact that your computer is connected to this network at a particular time. It also hides the fact that you are running Tails on this network. In some situations MAC address spoofing is not useful but can instead be problematic. In such cases, you might want to disable MAC address spoofing.
However, disabling MAC address spoofing makes it possible again for the local network to track your geographical location. If this is problematic, consider using a different network device or moving to another network. This computer is regularly used on this local network, and its MAC address is not associated with your identity.
In this case, MAC address spoofing can make it impossible to connect. It can even look suspicious to the network administrators to see an unknown MAC address being used on that network. On some network interfaces, MAC address spoofing is impossible due to limitations in the hardware or in Linux. Tails temporarily disables such network interfaces. You might disable MAC address spoofing to be able to use them.
source site Some networks only allow connections from a list of authorized MAC addresses. In this case, MAC address spoofing makes it impossible to connect to such networks. If you were granted access to such network in the past, then MAC address spoofing might prevent you from connecting. Using your own computer at home.
Your identity and the MAC address of your computer are already associated to this local network, so MAC address spoofing is probably useless. But if access to your local network is restricted based on MAC addresses it might be impossible to connect with a spoofed MAC address. When Tails Greeter appears, click on the button.
Other means of surveillance can reveal your geographical location: video surveillance, mobile phone activity, credit card transactions, social interactions, etc. Some captive portals might send your MAC address over the Internet to their authentication servers. Changing your IP address to another country is easy, and requires no more than a few mouse clicks. The effect is instantaneous, and your IP location will immediately change to make it seem like you are in the country of your choosing.
Changing your IP address with a VPN has numerous benefits, as it lets you change your IP address to another country and give you an extra layer of privacy, since nobody can see where you are surfing from. You can get it for desktop or mobile platforms, and there is a free 5-day trial version with no credit card required.