Re: ATM Traceroute middle packet loss?

["Eric D. Madison" <madison () acsi net>]

No, it's not a Sun issue, it drops every other packet only if I got over
the ATM Backbone.  I can trace to another router, a ATM Switch, A CSU
panel, anything and I get the same dropped packet.  
I did further testing, and it is every other packet, not just the middle one.

Eric


At 05:11 PM 9/27/96 -0700, maillists wrote:
> > 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.
>
> ---------------------------------------------------------------
> Web Professionals, Inc.          
> 20370 Town Center Lane, Suite 245               +1 408-865-0899
> Cupertino CA 95014 USA             http://web.professionals.com
> ---------------------------------------------------------------
>  World's largest Webspace provider with dedicated domain sites
>  Ref: Open Market's Commercial Sites Index www.directory.net
> --

- - - - - - - - - - - - - - - - -