Re: ATM Traceroute middle packet loss?

[Sanjay Dani(maillists) <indus () professionals com>]

> hmm..
>       Seems that every traceroute across an ATM link will result in the middle
> packet being dropped.  The ATM Switch nor the Router have any idea that it
> is the second packet.. weird! Anyone have a clue to why that is? 
>
> Tracing the route to ns2
>   1 206.222.97.6 44msec 44msec 44msec
>   2 ns2.acsi.net (206.222.97.50) 44 msec * 44 msec

I don't think it has got anything to do with ATM. I
bet you that ns2.acsi.net is a Solaris 2 box. Solaris
drops every other icmp echo if it comes too close to
the last one. This I was told is an inadvertent bug
although Sun could claim it to be a feature against
an ICMP flood attack ;-)

Try tracerouting to sun.com (a SunOS box) and
playground.sun.com (Solaris 2). You'll see the difference.
Also try traceroute with the -q parameter greater than
the default of 3 packets each destination.

Sanjay.

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