On Thu, 4 Mar 1999, Bernhard [iso-8859-1] L�der wrote:
> Ping is an ICMP packet. Many ISP's do not allow pings and traceroutes.
Traceroute is not an ICMP packet, it's a TCP packet sent to a port
which is expected to be unused. Packets are sent with increasing
time-to-live values (measured in hops), on the expectation that
when the TTL expires an ICMP TTL expired will be returned. When
the packet reaches the destination the expectation is that a
Connection Refused will be returned.
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