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I believe there maybe another bug on this FW for the DIR-878. I can't get OPEN NAT status on xbox one game console when connected to this model router. STRICT NAT is always reported by the game consoles using uPnP:http://forums.dlink.com/index.php?topic=74484.msg301041#msg301041
Furry,HQ tested with multiple topologies and got open NAT using your config file with 1.12B01 (except when connecting to another router they got mixed open and moderate). Are you connecting the 878 directly to the modem?Are there any settings in the cable modem that you changed?
No update. They cannot replicate the issue.