I did this: VMware KB: Virtual machines lose network connectivity in a vCDNI network pool
No difference and no connectivity between vm1 and vm2.
I run the lab it in a nested environment. Esxi 5.5 (latest build) in Esxi 5.5...
Edit:
I got it to work with a "Direct connection", to my own private network. But I wanted to have the network isolated from everything. Look at the attached image below; "Ex" works fine. But Why does not "Labbet" work? ( When its connected ;-) )