From: Kirk Graham (kgraham@instructors.net)
Date: Fri Mar 04 2005 - 13:09:47 GMT-3
It means that the destination device is a Cisco. Pretty much.
I've never found another device that does the same behaviour. Microsoft
doesn't. Bay/Nortel doesn't. Cabletron/whatever. None of the *nix varieties
I've tested.
I can't remember *which* RFC, but there's one that says something like if
you receive two successive UDP packets from the same source IP within some
timeframe, that you do not have to reply to the second packet.
If you get no response to a traceroute packet, the IOS displays an '*' to
indicate a timeout.
So Cisco is following the RFC standards. ITs probably an option thing, so
everyone else is as well.
Someone else may be able to find the specific RFC reference. Or maybe it
was in the traceroute spec. I really can't remember.
But its a nice fingerprinting technique! <g>
--kg
> Hi, dear all:
>
> I found that there are some "*" in the last line of traceroute result,
can somebody explain it?
>
> Thanks in advance.
> dillon
>
>
> r1#traceroute ip
>
> Target IP address: 197.68.1.1
> Source address: 200.200.200.3
> Numeric display [n]:
> Timeout in seconds [3]:
> Probe count [3]: 6
> Minimum Time to Live [1]:
> Maximum Time to Live [30]:
> Port Number [33434]:
> Loose, Strict, Record, Timestamp, Verbose[none]:
> Type escape sequence to abort.
> Tracing the route to 197.68.1.1
>
> 1 3.3.13.3 20 msec 24 msec 20 msec 20 msec 24 msec 20 msec
> 2 3.3.13.3 20 msec 24 msec 20 msec 20 msec 20 msec 20 msec
> 3 3.3.36.6 28 msec 36 msec 24 msec 28 msec 32 msec 24 msec
> 4 3.3.36.6 24 msec 32 msec 24 msec 24 msec 32 msec 28 msec
> 5 3.3.46.4 44 msec 40 msec 40 msec 40 msec 40 msec 40 msec
> 6 3.3.46.4 40 msec 40 msec 40 msec 40 msec 40 msec 40 msec
> 7 150.100.2.254 40 msec * 40 msec * 40 msec *
> r1#
>
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