What would be the meaning of 00-00-00-00-00-00 mac address which is shown on a LAN sniffer report? It has been identified as a noise but I am unable to find which station produces this type of information.
By using this inverse mask, you can divide your subnet in half to determine if the faulty NIC is in the first half of the subnet or the second. For example, if your faulty NIC had an ip address of 10.1.1.130, you could apply an acl like this:
access-list 1 permit 10.1.1.0 0.0.127
access-list 1 deny 10.1.1.128 0.0.0.127
With this acl applied, you should stop seeing the all 0s MAC address in your sniffer trace since the 10.1.1.130 address is denied. The acl I suggested just helps you narrow down what ip address is causing you problems.
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