what about 48 bits?

Matthew Kaufman matthew at matthew.at
Sun Apr 4 15:51:27 CDT 2010


Richard A Steenbergen wrote:
> On Sun, Apr 04, 2010 at 11:53:54AM -0300, A.B. Jr. wrote:
>   
>> Hi,
>>
>> Lots of traffic recently about 64 bits being too short or too long.
>>
>> What about mac addresses? Aren't they close to exhaustion? Should be.
>> Or it is assumed that mac addresses are being widely reused throughout
>> the world? All those low cost switches and wifi adapters DO use unique
>> mac addresses?
>>     
>
> http://en.wikipedia.org/wiki/MAC_address
>
> The IEEE expects the MAC-48 space to be exhausted no sooner than the 
> year 2100[3]; EUI-64s are not expected to run out in the foreseeable 
> future.
>
>   
And this is what happens when you can use 100% of the bits on "endpoint 
identity" and not waste huge sections of them on the decision bits for 
"routing topology".

Of course it comes with a privacy problem if you want to use that 
endpoint identifier globally and not change it for every session (as 
some protocols that separate routable-address from endpoint-identity do)

Matthew Kaufman




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