The module as written, doesn't have a fallback absolute path to find the ipconfig command on Win32 systems. This means that the PATH environment variable is the sole method used to find ipconfig. I would recommend modifying the package to look in c:\Windows\System32 for the ipconfig command if all other methods fail. This would make it a bit more robust. I tried submitting this as a bug, but the link for writing bugs against this module doesn't seem to be working for me.