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From: Joe C on 9 Apr 2008 22:46
Can anyone tell me what it means when traceroute shows the path to the
destination server and then at the end shows ***. I have seen *** when
the destination is not reachable but have never seen them after the
destination has been reached.

Here is an example

usawe001:/usr/local/sbin> traceroute 10.59.245.115
traceroute: Warning: Multiple interfaces found; using 10.58.8.4 @
bge0:1
traceroute to 10.59.245.115 (10.59.245.115), 30 hops max, 40 byte
packets
1 10.58.8.2 (10.58.8.2) 0.531 ms 0.316 ms 0.239 ms
2 10.160.2.35 (10.160.2.35) 0.364 ms 0.838 ms 0.510 ms
3 10.160.3.39 (10.160.3.39) 34.346 ms 34.505 ms 34.585 ms
4 10.160.3.71 (10.160.3.71) 37.638 ms 38.175 ms 37.779 ms
5 10.59.245.115 (10.59.245.115) 38.040 ms 37.706 ms 37.632 ms
6 * * *
7 * * *
8 * * *
From: Richard B. Gilbert on 10 Apr 2008 09:26
Joe C wrote:
> Can anyone tell me what it means when traceroute shows the path to the
> destination server and then at the end shows ***. I have seen *** when
> the destination is not reachable but have never seen them after the
> destination has been reached.
>
> Here is an example
>
> usawe001:/usr/local/sbin> traceroute 10.59.245.115
> traceroute: Warning: Multiple interfaces found; using 10.58.8.4 @
> bge0:1
> traceroute to 10.59.245.115 (10.59.245.115), 30 hops max, 40 byte
> packets
> 1 10.58.8.2 (10.58.8.2) 0.531 ms 0.316 ms 0.239 ms
> 2 10.160.2.35 (10.160.2.35) 0.364 ms 0.838 ms 0.510 ms
> 3 10.160.3.39 (10.160.3.39) 34.346 ms 34.505 ms 34.585 ms
> 4 10.160.3.71 (10.160.3.71) 37.638 ms 38.175 ms 37.779 ms
> 5 10.59.245.115 (10.59.245.115) 38.040 ms 37.706 ms 37.632 ms
> 6 * * *
> 7 * * *
> 8 * * *

It means that "6", "7", and "8" have disabled traceroute! Lots of
people do these days. Once upon a time it was a useful tool, then
everyone used it just because it was there. Now it doesn't work any longer.
From: Helmut Kreft on 10 Apr 2008 18:10
On Wed, 9 Apr 2008 19:46:22 -0700 (PDT), Joe C wrote:
> Can anyone tell me what it means when traceroute shows the path to the
> destination server and then at the end shows ***. I have seen *** when
> the destination is not reachable but have never seen them after the
> destination has been reached.
>

traceroute expects to receive an ICMP Port Unreachable if the
destination received the UDP probe. Until that occurs, traceroute
will continue to increment the TTL and wait for ICMP time exceeded
messages. Not sending or discarding ICMP Port Unreach somewhere on
the way to the traceroute program will produce the observed behaviour.

Helmut

--
Almost everything in life is easier to get into than out of.
(Agnes' Law)
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