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vSphere - Limited Traffic Between VMs on different hosts following switch migration

Posted on 2016-08-19
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Last Modified: 2016-08-22
Hello, we just migrated to distributed switches for our VMs on a VMware 6 U2 cluster. Following the upgrade, our VMs are having trouble talking to each other when they are on different hosts. They can ping each other by name, but things like Windows traffic won't go through. Move the VMs the same host and they can talk just fine.

We've been on the phone for hours with VMware support and getting nowhere. Its an odd problem as this was working before the switch migration. But now even when we move the VMs back to standard switches the problems continue.

I know that's all pretty vague, but if anyone has some insight, I'd appreciate it.
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Question by:willp2
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Andrew Hancock (VMware vExpert / EE MVE^2) earned 500 total points
ID: 41763317
you can ping,  but Windows traffic won't go through ?

what is a ping then?

what windows traffic ?

firewall configs? VLAN issues?
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by:willp2
ID: 41763359
By Windows traffic I mean RDP and file sharing, that sort of thing. VMs can ping each other, but nothing else if they are on different hosts.

There is no firewall between the two and no ACL on the LAN. The VLANs all seem to be working correctly. We can see the traffic but its getting lost some place. Looking at physical switches at the moment.
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you are using VMXNET3 interface ?
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by:willp2
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There was a problem with physical switching after all. Thanks for the comments.
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