The switch (postman) will simply not know who to deliver to as the MAC (house) addresses will be the same. This can lead to network problems if you have more than one libreboot computer on the same layer2 network (e.g. on the same network switch). Unless you change it, your computer will boot and use it. This address is 00:f5:f0:40:71:fe in builds before and00:4c:69:62:72:65` (see the ascii character set) afterwards. Thus, for these laptops, prebuilt libreboot already contains a generic MAC address in the configuration section. Therefore, installing libreboot will overwrite it. On all these laptops, the MAC address for the built-in gigabit ethernet controller is stored inside the flash chip, along with libreboot and other configuration data. The R500 is an exception to this as it does not use the built-in e1000. This section is applicable to all libreboot-supported laptops with the mobile 4 series chipset (as shown in $ lspci) that use the e1000 ethernet controller (e.g. T400, X200).
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