[nSLUG] Re: MAC-address/router question
nslug at fop.ns.ca
Fri Dec 9 10:00:25 AST 2005
On Fri, 9 Dec 2005, Bill Davidson wrote:
> They did the math and figured that, with 32 bit addresses, the
> likelihood of a MAC address collision on even large networks was
> essentially nil, but then they decided that people who didn't do the
> math would see that as a weakness and use other technologies, so they
> went with the "guaranteed unique MAC address" idea -- which you point
> out isn't always so guaranteed.
And of course, due to human nature, certain 32 bit numbers are less unique
than others. The prime examples are 0xc0a80001 and 0x0a000001, or, to
deobfuscate... 192.168.0.1 and 10.0.0.1. Whilst it's not perfect, at least
attempting to force every NIC to have a unique address stops another
avenue of problems.
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