Hi
If you can't add another network card to the configuration or have to have SSH enabled, then you have to disable those warnings in Advanced Options/Settings. The latter will be for each ESX(i) host.
For the first one, see: http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1004700
For the second, see: http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2003637
Hope this helps!
Ather