Got with D-Link support again this evening, though this time I was sent to tier 3 support & AR004627 helped me out, problem resolved.
Someone previously said that the router could not have a LAN IP on a similarly appearing WAN IP, this is far from the case. As long as the subnet is different then it's fine, matter of fact say your WAN IP is 10.1.1.21/255.255.255.0, your routers LAN IP could be 10.2.1.21/255.255.255.0 if you wanted it to be.
It could even be further segmented and be in the same IP space as long as the netmask is correct.
255.255.255.224
255.255.255.240
So to say that the router cannot be in this IP space is technically incorrect & misleading, but I understood why they'd say it, most people using this equipment have the technical IQ of a celery stalk and are just looking for low lag time & a high Gamerscore.
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Anyway,
When I setup my network with the DIR-655 the LAN IP was not part of the DHCP range but resided in the same subnet and it worked fine
For example it was 10.1.1.2 and the DHCP Range was 10.1.1.12-10.1.1.254 so I assumed the same for this router.
Well nope, evidently the router actually follows RFC-2131 & must be within the range for DHCP to work., so this was a mistake on my part and I own that. I felt a little stupid not bothering to try that.
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If anyone has any questions, I'll be monitoring this router for the next few weeks, it's got a ton of responsibilities right now. Loads of wireless devices, servers, storage, other wireless networks, bridges, video casting devices ...etc that it has to manage so we'll see where it goes from here.
I would seriously like to have someone get back to me about more ways to tune this thing, we need more logging & more control in the gui!
Thanks for the assist guys!
-hammerite