How do I block incoming ping?

[Brian49]

How do I prevent my 7700N from responding to incoming ping (ICMP echo), please? It's dead easy with the 7800, which has a tickbox for that in its web-based GUI, but I can't see anything similar with the 7700N. A test shows that it does respond to incoming ping. I've tried creating a new rule in the IP filtering config, but that doesn't work, although I might not have created it in the right way. Many thanks.

[dmpfran]

Management->access control->services, untick WAN ICMP enable

[Brian49]

I never thought of looking there! I just assumed it would be one of the Security settings. Thanks very much indeed.