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Recent Linksys, DLink and other routers' firmware allows you to configure the router to be unpingable from outside. "Block WAN Requests" for older devices and "Block Anonymous Internet Requests" for newer 'Cisco' branded devices. DLink uses "Discard PING from WAN side". Enabling these router features will break monitoring.
We recommend if you wish to be monitored, do not select the "Block WAN Requests"/"Block Anonymous Internet Requests"/"Discard PING from WAN side" option on the router configuration screen. Your router can still be password protected, and will be secure.
Also try disabling "SPI" , as this also may block external pings.
To make the Motorola NVG510 pingable, follow the instructions in this thread: »Motorola NVG510 question