what is a ICMP echo request? mot to familiar with wireless.
The Echo Request is an ICMP message which sends a packet of data to the host and expects that data to be sent in return in a Echo Reply. The host must respond to all Echo Requests with an Echo Reply containing the exact data received in the request message.
So by blocking ICMP echo replies your system will not respond to ping requests and it would make your system not visible on the net. At least by sending ICMP type of data/traffic to it. Cheers, 0x0161
PS ping has nothing to do with wireless.
It has been around WAY BEFORE wireless has. Also, windows boxes you can use ping or pathping which consists of both (tracert & ping) in one command.