Prev: How connect PC Embedded to MDB (Vending Machine)
Next: High-end AVR vs. low-end ARM?
From: Alex on 4 Oct 2008 05:40
Purchase enough of 5464E-I quad nics, use MACs , they are printed on boards,
destroy NICs.

Alternatively get Sun QFE or any other boards.

Your device will be seen by sniffers as vendor's appliances.

Unless quantity is large.

Alex







"Blip" <blip(a)krumpli.com> wrote in message
news:ohbbe4h1tthpq7gls481cr31f3adq1c5gv(a)4ax.com...
> This seems to me like a dumb question, but I don't know what the
> answer is...
>
> We are building a product using the LPC2368 (which has a MAC) & a
> Micrel KSZ8721 (PHY). As part of the prototype programming effort, I
> include a random MAC address in software as part of an init sequence.
>
> When this goes onto other networks, the MAC addresses have a chance to
> collide w/ *real* ones. It seems to me that NXP should provide the MAC
> addess pool since they provide the MAC, but that's probably not true.
>
> Do we need to go to the IEEE & purchase our own OUI?
>
> Thanks for the advice...


From: Anton Erasmus on 4 Oct 2008 06:50
On Fri, 3 Oct 2008 16:43:28 -0700 (PDT), certsoft <bob(a)certsoft.com>
wrote:

>Blip wrote:
>> We are building a product using the LPC2368 (which has a MAC) & a
>> Micrel KSZ8721 (PHY). As part of the prototype programming effort, I
>> include a random MAC address in software as part of an init sequence.
>>
>> When this goes onto other networks, the MAC addresses have a chance to
>> collide w/ *real* ones. It seems to me that NXP should provide the MAC
>> addess pool since they provide the MAC, but that's probably not true.
>>
>> Do we need to go to the IEEE & purchase our own OUI?
>
>One method is to use a locally assigned prefix and use something like
>a DS2401 serial number chip for the lower bytes. Since MAC addresses
>are only local to a subnet, the chances of a collision are pretty
>close to nil. More info at http://www.certsoft.com/mac.htm

Maxim has a device specifically for MAC addresses. It is one of the
1-Wire devices, which has a legal MAC address stored in the device.
It is the DS2502-E48 AFAICR. For small runs, this is quite handy. It
helps a lot from the logistics point of view as well, since one does
not need a step to program a legal adress into an EEPROM or something
for each PCB.

Regards
Anton Erasmus
First  |  Prev  | 
Pages: 1 2 3 4
Prev: How connect PC Embedded to MDB (Vending Machine)
Next: High-end AVR vs. low-end ARM?