as long as you forward the port correctly (8090) on your router to be needed by (you DVR IP : 192.168.1.64), you should be able to view your DVR
by typing the IP given from your ISP (www.whatismyip.com).
It looks like I have same router, dvr and problems. Same ports at dvr, same ip configuration at router.
How did you solve it?
It doesn't work
Same dvr worked fine with another router, another ISP, was easy to set up. Not now