2006-03-05 16:31:53 Local7.Info xxx.xxx.xxx.xxx 417: Mar 5 16:40:08.885: %C4K_L2MAN-6-INVALIDSOURCEADDRESSPACKET: Packet received with invalid source MAC address (45:00:00:3C:A6:D4) on port Fax/xx in vlan xxx
i've checked, this switcport is connected to the server. i just curious about, would it be the application caused the multicast (invalid mac-address) ? normally in what situation and environment will occurred ?
what can i do now ? disable the switch port ? change the NIC ? or etc ... ?
How many of these packets are you getting ? If it's a small number, I would not worry about it too much.
However, if the number is significant you might not need to isolate it to the application on the server. In general, the IP to MAC conversion is done by the ethernet stack. But it may be an issue with the NIC or a mis-behaving application. It is not always easy to find out which application is causing it. You could do a couple of things (but none of those may solve the problem):
- replace the NIC
- shut down one app on the server at a time and see if the packets stop
Basically, what he meant is how often is the switch logging the message? if it's logging every second that's a "significant" number that that server is generating, if the message is being logged once a day then the server is generating the invalid packet at a "very small" amount. The question is why it's generating that packet? as the message indicated this is an invalid packet.
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