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we had something similar,
on each port group we have set the load balancing type to "route based on IP hash" and this resolved the problem.
I've tried this before and it didn't help or work unfortunately
Almost sounds like PVLANS are configured somehow until the first ping.... When you clone, do you recreate the UUID. Have you verified your dVS configuration? If you have, I would suggest you open a case with VMware as that just does not sound right.
Edward L. Haletky VMware Communities User Moderator, VMware vExpert 2009
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Just to make sure if anyone comes across this, i found the answer and have blogged about it here: http://thesaffageek.wordpress.com/2010/03/08/vms-cant-ping-while-on-distributed-virtual-switches-vlans/
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Gregg Robertson, VCP3,4 , MCSE, MCSA, MCTS, MCITP