Accessing Network Place (Samba) Share over Internet

Hello,

I just set up the Network Place (Samba) Share on my ACRH17 using external usb HDD.
I can access this drive using the devices under the same router (ACRH17).
However, can you let me know how I can access this Samba share over the Internet?

For example, I am using Asus DDNS service, menas.asuscomm.com.
So, I tried to connect menas.asuscomm.com:445, but it did not work.