You need to provide more info to be able to help you. Describe how your network is setup. What is your WAN uplink, i.e. the device that your Mercusys unit connects to. One observation in your webconfig is that the WAN port rate setting is suboptimal, it should be set to auto at the very least, or 100Mbps (if the Mercusys is only fast ethernet) or 1000Mbps (if it is a gigabit router) full-duplex, if auto is not available.