The IP address assigned to the DWL-G810 (192.168.1.30) is only of importance when configuring the device. Though it would be best to reassign it an address on the same IP subnet as the rest of your network (ie 10.0.1.x where x>200) to facilitate future configuration, doing this should not be essential to its ability to function as a wireless bridge device.
Have you updated the DWL-G810 to the most recent available firmware version available from D-Link (ie version 2.15)?
Have you updated the DWL-G810 to the most recent available firmware version available from D-Link (ie version 2.15)?