In my cloud, I have deployed many vApps from the same template. VMs within a vApp use vApp lan to communicate.. Since the vApp LAN is not connected to outside, all the vApps use the same IPs for vApp LAN. I have not seen any problems till now. But now, few VMs are not able to communicate over the vApp Network. Ex, If I have 5 VMs in the vApp, 3 VMs are able to communicate with each other but other two are not. There are no events/alarms are reported related to networks in vCNS/vCloud/vCenter. I am facing this issue multiple times now. \
I am using VCNI backed network pool.
What could be the problem here?