my hardware is DSL-2750B H/W T1 firmware AU3.08.
i tried to follow up the instruction on the dlink site to setup the DDNS on the router, opened an account on dlinkddns.com,
https://www.dlinkddns.com/howto
but when i entered required infor on the router DDNS page (provider, host, user/password etc), the DDNS entry still shows 'offline'.