For my BBB Virtual machine on Windows 7, I need to have NAT settings with custom port mapping. VMPlayer does not have the "vmnetcfg" program extracted at install time, so custom NAT settings are not possible.
To manually extract the "vmnetcfg" configuration program, after installation, re-execute the VMPlayer steup program as:
Drive:> VMware-player-?.?.?-??????.exe /e .\VMTools
This will extract the all the installation files into "VMTools" directory. One of the extracted files is a cabinet file called "network.cab", which contains "vmnetcfg.exe". Open "network.cab" (as a folder) and copy "vmnetcfg.exe" and paste it into the installation root of "VMPlayer"; (usually: "C:\Program Files\VMware\VMware Player")
Run "vmnetcfg.exe" and this will give you full access to detailed network settings of all your virtual machines:
Click on NAT settings and you get: