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PING itself works because there is a standard service on a well known port (ECHO). You send a packet, it sends it back. So you can send packets to any port you want, but unless they are attached to an ECHO server, they aren't ever coming back, and PING will just say that it 'Timed out'.
Sorry, this isn't true. PING doesn't use the "echo" service. PING is an internal function of the ICMP (Internet Control Message Protocol). You send an ICMP echo packet (or, more correctly, "datagram") and it sends back an echo reply. This is built into the core of the IP stack.
It has nothing to do with the "echo server" that people used to run on port 7.
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