System information

C-42
Troubleshooting
Diagnostic Tools
Figure C-18. Example of a Completed Traceroute Enquiry
Continuing from the previous example (figure C-18, above), executing
traceroute with an insufficient maxttl for the actual hop count produces an
output similar to this:
Figure C-19. Example of Incomplete Traceroute Due to Low Maxttl Setting
If A Network Condition Prevents Traceroute from Reaching the
Destination. Common reasons for Traceroute failing to reach a destination
include:
■ Timeouts (indicated by one asterisk per probe, per hop; refer to figure
C-19, above.)
■ Unreachable hosts
■ Unreachable networks
■ Interference from firewalls
■ Hosts configured to avoid responding
Intermediate router hops
with the time taken for the
switch to receive
acknowledgement of
each probe reaching each
router.
Destination IP Address
Traceroute does not reach
destination IP address
because of low maxttl
setting.
The asterisk indicates there was a
timeout on the second probe to the third
hop.