Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)
You always need to ensure tha VMware vSphere is only as god as your DNS resolution, forward and reverse, get into the habit of using FQDNs everywhere with VMware vSphere and NOT IP Addresses.
In later versions of vSphere, you will NOT be able to install if you do not have forward and reverse DNS setup before you install!