Rickard,
I have 1 VM with two interfaces. They both are on the same vswitch, but one is a different Ip address. However when I shut down this VM, the network loop issue did not go away.
I did not look in the networking performance - shame on me. I was in a hurry to get the services back up and running. Is there away to go back in time?
I am using a cheap Linkskey gigabit unmanaged 24-port switch. When I briefly looked at it, nothing looked abnormal. But the switch doesn't have any fancy diagnostics on it. I did try plugging in the ESXi box directly into my Cisco router while the issue was going on and the same issue occurred after a minute or so.
Josh,
Thanks for the explanation of the spam bots. The switch is not managed. It's a real simple 24-port gigabit Linkskey and one link goes into my Cisco 871W router.
Mike