broadcast ping

Spent a lot of time last evening investigating pings from x.y.z.15 - PB was called by V saying .15 is replying to pings, it is some machine in your network. At first, I suspected some machine in CG's studio; then krishna. Checking out ifconfig on krishna, x.y.z.15 was the broadcast address on our subnet! Our subnet mask was 255.255.255.248, so it follows...

Pinging from a NATed machine gets a reply only from the gateway. Pinging from the machine with x.y.z.n address gets replies from all machines in subnet - other than windows machines, of course, which don't respond to broadcast pings.