Re: MAC address change
On Sun, Jun 22, 2003 at 01:54:33PM +0200, Adam ENDRODI wrote:
> How widely do you think changing the MAC address of a NIC via
> ``ifconfig <if> hw'' is supported by the various network cards
> and drivers out there nowadays?
>
> My collegue and me have debated several times whether watching
> the LAN for non-matching IP-MAC pairs can reveal any useful
> information. I argued that it may not, since the MAC is easily
> alterable, but he objected, because it's not. Now I ask you to
> decide who is right.
I have no statistics on that topic. But by now I could change about
every MAC address. I use it for cold-standby machines which I can bring
up if one machine fails. The network does not need to know anything has
changed.
IMHO the MAC address is no proof of authenticity.
Christoph
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