I'm not quite sure why this is disabled by default, but I never seem to get a ping response from my router when checking from work.
When checking at home on the internal LAN, it works fine.
I kept poking around the firewall settings but nothing was there.
Then I stumbled across "Access Control" hidden away under "Management".
Click on "ICMP" to enable it under the WAN column.
That'll do the trick just fine!
You should now be able to ping your router from the internet.
