When using Host-Only connections under VMware or VirtualBox - Your network will be private and cannot be traced with other networks. In this situation there is a simple and effective solution for the same - Port-Forwarding.
Port Forwarding is very simple and you can trace the particular Virtual Machine Instance's Port form external network,internet.
Ill be showing how to do Port Forwarding for VitrualBox, if someone wants to know about VMware - please do pull up a request or email me.
To learn how to do Port Forwarding for VirtualBox click here.