... That's a security problem ...
Milage varies, for two of the four words in the phrase above.
Some enet nic vendors allow the mac address to be user defined.
Most inet i/f vendors allow the ipv{4|6} address to be user defined.
...
The user defined character of these properties of network attachments
do not carry with them sensible guarantees about the uniquenss of the
user-defined MAC, anywhere, or the routability of the ip{4|6} address,
or ...
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