So I'm new to the DIR-825 devices, but I have used both Virtual Servers and Port Forwarding on several hundred routers in the last 10 or 15 years as an on-site contractor for ISPs and the local Clec and Ilec. The point is, I think there may be something strange about the Port Forwarding in the DIR-825 Hardware Version: B1 Firmware Version: 2.05NA.
I'm currently setting up a pair of these puppy's, using one as the GW router and one, probably the first of several, as a simultaneous dual band AP out on the production floors of a local company. Everything was normal and as to be expected until I set up WAN access for the security DVR, ports 7000, 80, and 88 for both TCP and UDP. Bammo, access to the IQMS production management server ceased. Well you could see it, you could access files stored on it in the Mapped drives, but you could no longer log into it, via wireless or wired. It would seem that the port forwarding is working in the LAN as well as the WAN.
Anyway, since my job is just to make things work, make a few notes, and get the hell out of the way, I switched to Virtual Server and no problem... (I haven't tested the WAN access to the DVR yet, but at least folks can get back on the IQ to see what it is they are supposed to be doing.)
I just dropped in here to clear up some intermittency I am seeing thru the AP, and saw this posting and thought it might be worthwhile to leave a comment. While I am at it though, I do appreciate the notes in the 4500 forum about turning a router into an AP. I had forgotten about turning off the UPnP. I'll confirm back if I actually get the second 825 into a stable AP mode configuration. Thanks