If the machine is sitting behind a NAT router is the ping test valid?
I thought that the router under normal circumstances is the device that will react to the ICMP traffic, and no machine behind the router will react to the ICMP traffic.
When a router or FW appliance has the ability to set rules to stop ICMP traffic, just what is happening? Is the device just not responding or what? What is the device doing?
The reason I am asking is I got someone that's asking does he have to set the personal FW to block ICMP traffic behind the NAT router, because of this Gibson's ping test.