This module is a scanner which can detect Broken NAT (network address translation) implementations, which could result in an inability to reach ports on remote machines. Typically, these ports will appear in nmap scans as 'filtered'/'closed'.
To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':
Time is precious, so I don’t want to do something manually that I can automate. Leveraging the Metasploit Framework when automating any task keeps us from having to re-create the wheel as we can use the existing libraries and focus our efforts where it matters.
– Jim O’Gorman | President, Offensive Security