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For questions about trace routing where, for instance, you are troubleshooting routing issues or have problems using the traceroute command via CLI on a network device.
29
votes
Difference between unresponsive (*) and unreachable (!H) hosts in traceroute output
H means that your machine received ICMP message "destination host unreachable" from the host indicated in the traceroute output.
Rarely traceroute can indicate also other unreachable messages like ! … The drop caused by a security policy depends on the type of the message sent by traceroute. …