People can't connect.

[mariokiller64]

So I have this RT-N16 router with DD-WRT and DMZ enabled and DDNS configured to update my domain. One sudden day, no one could access anything and I'm going crazy trying to find the solution. I tried connecting directly through the modem and then everything worked fine through my IP address and everyone was able to connect. But I couldn't use DDNS with just my modem, so that was a pretty big drag considering my IP changes frequently.
I feel as if DMZ isn't working at all. None of my ports are being forwarded. Any solutions? Please and thank you.

[mariokiller64]

bump.