speedstream 5660

[microsys]

I have a SpeedStream 5660.
I have configured a web server on my local lan,
and it works fine there.
I am using Dynu Basic to translate my dynamic IP
address to xxxxx.dynu.com

However, when I connect to xxxx.dynu.com, the router
does not forward the http packet, but instead
connects to the router's configuration page, just
as if I connected locally to 10.0.0.1.

How do I get the router to forward packets on the
WAN side (internet) http to the LAN?

Thanks,

Glen