First of all, I'm a complete newbie when it comes to network topics.
I'm using a Banana Pi for Samba, media center and other stuff at my home network. As I have a Hitron router I'm able to use Port Forwarding to access my local network from remote.
Setting up Port Forwarding at the router I found out that you can enter a different internal port than the external port. Now if I want to access my Banana Pi via SSH, is it possible to connect to it using another port than 22, i.e. 12345, to "hide" the accessibility of port 22 for others, so I just type abcd.efghij.klm:12345 into PuTTY (with my Banana Pi having a DynDNS configuration given of course) which would route to my router's ip at port 22?