Setting up internet dns hosting service to run home security camera?

I have a linksys wrt150n router and a linksys wvc200 internet camera. I have dns service host with dyndns.com all set up. The system works fine on my local network but not able to access from remote location off my own network. Not sure whats going on here. I set up dmz, open ports, enabled dns on my network devices. hmmmm. whats next to trouble shoot here? any help I would appreciate, going mental here, been working on this 2 days. thanks