2. Detects destination unreachable and reports reason
When doing a traceroute to a remote host, it is possible an intermediate
router will respond that the destination is unreachable and give
a reason code. IPNetMonitor listens for this response, stops waiting
for the trace response, and reports the reason code.
A red "X" indicates no response within the timeout period.
An orange "X" indicates an ICMP destination unreachable
response was received.
AGNetTools acts as if the trace completed successfully.
Mac TCP Watcher correctly indicates the host is unreachable (!Host)
OTTool correctly reports the host is unreachable.
WhatRoute correctly indicates the host is unreachable (!H), but
doesn't stop tracing.
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