What would be a reason why a virtual machine computer can not PING another virtual machine computer?

I have 2 hosts machines and each machine is running a windows 7 as a virtual machine with VMWareThe settings in VMware have been to change to bridge connectionsIf hostA has guestAnd hostB has a guest and the guestA can PING its own host(A) and hostB, why can't GuestA PING with guestB?