VirtualBox uses the hardware on the host and provides the MAC address for the guest as if it were in metal. Guest MAC address information is generated by the physical hardware, in this case the VirtualBox network adapter. The “official” method of operation is to change the address in the virtual machine settings when the guest computer is completely turned off. VirtualBox does not support changing the MAC address inside the guest virtual machine. Why is this happening and how can I fix it? Restarting the modem does not give results, there is no filtering by MAC addresses. When changing only the last three octets, the situation is the same. Virtual machine, after changing MAC address of eth0, the connection does not work.
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