no internal connection between 2 VMs

I am using windows 8 hyper-v.

I added an internal virtual switch for hyper-v, assigned IP 192.168.1.100 to it.

Then I created 2 VM, assigned 192.168.1.101 with gateway IP above to one VM, and 192.168.1.102 to another.

VM couldping 192.168.1.100 but for VM I could not ping each other..., no internal connection between 2 VMs