How to find my Ethernet Card MAC address?

MAC or Media Access Control is the other name for Ethernet Card Address. Ethernet was originally developed by Xerox then further developed by Xerox-DEC-Intel. Before the name was Alohanet. The name was taken from Palo Alto Research Center Aloha Network.
Ethernet was named by Robert Metcalfe. Maybe, Ethernet means carry data [...]

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Virtual Box Error – A Domain Name Server (DNS) for NAT networking could not be determined

A Domain Name Server (DNS) for NAT networking could not be determined. Please, check your /etc/resolv.conf for nameserver entries. Either add one manually (man resolv.conf) or ensure that your host is correctly connected to an ISP. If you ignore this warning the guest will not be able to perform nameserver lookups [...]

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