DE619

Ok I'm forwarding my ports, I put in my external IP address, have the DNS server and the GTS running but for some reason I still can't connect with my DSi. What am I doing wrong? EDIT: Nevermind I figured out that I can't connect because I was inside my own network. I tried using my neighbor's router and it worked. EDIT 2: Sorry if this is the wrong thread to post it in but how to you protect your IP address if you do a public distro?