Any ideas why i keep getting a lot of these in my kernel log?
Apr 14 06:29:21 machine vmkernel: 1:01:31:58.305 cpu0:1084)Net: 4203: unicastAddr <unicast address removed>
?
One of your VM is broadcasting on a multicast adress, and the VMkernel is informing you of it; it can be helpful for security reasons.
If the machine is not configured to be multicast by purpose, you can reconfigure it to what you expected but here is a kb describing what each mode does and determine from there. Its being use when you configure NLB cluster
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Regards,
Stefan Nguyen
VMware vExpert 2009
iGeek Systems Inc.
VMware, Citrix, Microsoft Consultant