8 Nov
2006
8 Nov
'06
8:26 p.m.
On Wed, 2006-11-08 at 13:59 -0500, Lei Sun wrote:
Yeah, i suppose so. I connect my host to the board with a hub, give them static IP, and set the MAC address to be the same as my host's MAC, except one byte. Then I sniff the packet on my host using ethereal.
Which byte do you change? Don't touch the left-most one, as its bits have special meaning. When you say you 'set the MAC address', how do you do it? Does the 'Source Address' field in the ARP packet sent by your board match the MAC address that you set?
Is the MAC address being compared in CPM's micro code ?
Unicast addresses are compared to registers in the CPM, which may be implemented in microcode but that's neither here nor there.
regards, Ben