HP ProCurve Management And Configuration Manual page 646

Troubleshooting
Diagnostic Tools
Figure C-28. Example of a Completed Traceroute Enquiry
Traceroute does not reach
destination IP address
because of low maxttl
setting.
Figure C-29. Example of Incomplete Traceroute Due to Low Maxttl Setting
C-62
[probes < 1-5 >
For the current instance of traceroute, changes the number of
queries the switch sends for each hop in the route. For any
instance of traceroute, if you want a probes value other than
the default, you must specify that value. (Default: 3)
A Low Maxttl Causes Traceroute To Halt Before Reaching the
Destination Address. For example, executing traceroute with its default
values for a destination IP address that is four hops away produces a result
similar to this:
Destination IP Address
Continuing from the previous example (figure C-28, above), executing
traceroute with an insufficient maxttl for the actual hop count produces an
output similar to this:
If A Network Condition Prevents Traceroute from Reaching the
Destination. Common reasons for Traceroute failing to reach a destination
include:
Intermediate router hops
with the time taken for the
switch to receive
acknowledgement of
each probe reaching each
router.
The asterisk indicates there was a
timeout on the second probe to the third
hop.