Em 26/1/2011 12:16, Bob Ammerman escreveu:
>> Bob Ammerman wrote:
>>> I ran into a nasty problem with having a 10MBit device plugged into a
>>> 10/100 switch. There was so much broadcast traffic on the network
>>> that the switch couldn't send it all out the port. The 10MBit device
>>> had no interest in the broadcast stuff. Random packets were dropped,
>>> including many directed to the 10MBit device. Luckily the switch was
>>> a managed switch and it could be told not to route the broadcast
>>> packets to the 10MBit port.
>> Olin replied:
>>
>> If the 100Mbit traffic was so high that the switch couldn't cram it all=
=20
>> onto
>> the 10Mbit wire, then how was the little micro supposed to handle it if =
it
>> were connected at 100Mbit?  It seems the overall problem was too much
>> bandwidth.  Making the micro do 100Mbit would only have moved the proble=
m.
>> Packets would have been dropped in the micro instead of the switch, but=
=20
>> with
>> the same overall result.
> But I could have told the NIC to ignore broadcast packets and the poor=20
> little micro would never see them.


Then you may have communication problems. ARP usually uses broadcast to
discover the IP addresses of devices connected to the local network.
If your device doesn't receive broadcast packets then it cannot be found
automatically by other hosts. You would need to add it manually to the
other hosts' routing tables (arp -s).
If your device always takes the initiative to communicate then it is not
a problem, or if your device keeps sending broadcast packets then the
other hosts may discover it without searching.

Isaac

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