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Both routers are giving out IP address? Also the D-Link router should not be working if the WAN port and the LAN side are on the same subnet. That should not work unless the router is in AP mode, but not sure if that option is available. Check the default gateway IP address on your computer. That should be the IP address of the D-Link router IF it is pulling the IP settings from it. If it brings up the NG router, you are getting the IP from the NG router and the D-Link router is somehow passing the information through.