It doesn't appear that DNS is working right - I can ping out to Google DNS and other sites just fine. DNS works just fine from the PK5000. Neither clients nor the RT-N16 can utilize DNS.
Qwest/Centurylink PK5000 on 192.168.0.1, pulling DNS from upstream
Asus RT-N16 WAN port at a reserved 192.168.0.10, in the PK5000's DMZ
Asus RT-N16 LAN / Wireless on 192.168.1.1 gateway
Clients pull DHCP 192.168.1.x fine and have RT-N16 192.168.1.1 as gateway, DNS, WINS
Most recent build of Tomato Toastman (based on 1.28, not sure the number, I am posting from work)
Basic / Network / WAN - Route Modem IP is 0.0.0.0…should this be set to 192.168.0.1? (I can get to the modem and the router currently with no problem…what does this do, anyway?)
Basic / Network / LAN - Static DNS of 126.96.36.199 and 188.8.131.52
Wireless Mode is Access Point
Advanced / DHCP/DNS - Use internal DNS checked, Use recieved DNS with user-entered DNS checked, Prevent DNS-Rebind attacks is un-checked
Router is in router mode
I can see where RT-N16 is getting the CenturyLink DNS servers from the PK5000 as well on the status page.
Hopefully I've not left out anything useful to explain this, but I'm at work right now and don't have it all in front of me. I have also tried with emtpy Static DNS as well as CenturyLink DNS entries there and there was no change.