Hello! I have a problem almost like this!
I have a dvr with cameras and the modem, sagemcom 1704 Pppoe! And I can access my dvr, which is in DMZ and static lan ip, with LAN IP but when I try to access with "example.no-ip.com" or with dyndns it access the modem! I tryed to put a different port in dvr like 8091 or 8050 and access "example.no-ip.com:8091" but then it doest access anything.
can you help?? thx!