Zdravei
The hardware address of a network card (also known as mac
address, ethernet address) is usually burned into the *ROM of
the netword card. Some of the new cards (especially those
built into the motherboard) allow one to change the value
of the hardware address.
For all practical purposes, the need to change the hardware
addres can be addressed at a purely software level because
the network card (usually) by itself does not perform any
function involving the hardware address.. (i.e. it doesnt
send anything over the wire by itself)
The software responsible for handling the bits coming in
through the wire can be fiddled around with to change the
hardware address easily. (under linux, one can use ifconfig)
Some of the interesting things one can do: (listing only one :-) )
* Listen on multiple hardware addresses at the same time.. that
is one machine can be made to appear as n machines..
(no.. I am not talking about multiple IP Addresses)
If there is still confusion regarding hardware address, think
about where is it used (and why) and where are the packets
constructed and all...
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