Hi Guys,
I'm having a similar issue in test environment. I'm using VLAN Backed network pool. Created a vApp and added two VMs in it. Both VMs can ping their gateway as well as Org VDC Network, but can't ping each other. I added another VM and it could ping it's gateway and also ping one of the other two VMs created earlier but couldn't ping.
I migrated all the VMs in same host as the vApp network then all works fine. Any help please!!