HP PROCURVE 6120 Bedienungsanleitung PDF herunterladen (Seite 518)

100

101

C-64

Troubleshooting

Diagnostic Tools

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-15, above.)

■ Unreachable hosts

■ Unreachable networks

■ Interference from firewalls

■ Hosts configured to avoid responding

Executing traceroute where the route becomes blocked or otherwise fails

results in an output marked by timeouts for all probes beyond the last detected

hop. For example with a maximum hop count of 7 (maxttl = 7), where the route

becomes blocked or otherwise fails, the output appears similar to this:

Figure C-16. Example of Traceroute Failing to Reach the Destination Address

At hop 3, the first and

third probes timed out

but the second probe

reached the router.

All further probes

within the maxttl

timed-out without

finding a router or the

destination IP

address.

An asterisk indicates a timeout

without finding the next hop.

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