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Re: 20010924: UCAR network slowness?

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  • Subject: Re: 20010924: UCAR network slowness?
  • Date: Mon, 24 Sep 2001 17:21:11 -0600
"Arthur A. Person" wrote:
> 
> Anne,
> 
> On Mon, 24 Sep 2001, Anne Wilson wrote:
> 
> > Hi Art,
> >
> > motherlode is running on time.  However, University of Washington is
> > also reporting long latencies.  We're doing traceroutes from motherlode
> > to a variety of sites.  On Abilene, times to Texas are good, times to
> > Utah, Washington, and the East appear to be bad.  Here's the traceroute
> > to your site:
> >
> > motherlode.ucar.edu% traceroute ldm.meteo.psu.edu
> > traceroute to ldm.meteo.psu.edu (128.118.28.12), 30 hops max, 40 byte
> > packets
> >  1  mlra-n13 (128.117.13.253)  0.385 ms  0.240 ms  0.316 ms
> >  2  vbnsr-n2 (128.117.2.252)  1.171 ms  0.340 ms  0.478 ms
> >  3  internetr-n243-104 (128.117.243.106)  0.692 ms  0.461 ms  0.474 ms
> >  4  denv-abilene (128.117.243.126)  248.643 ms  224.281 ms  233.589 ms
> >  5  kscy-dnvr.abilene.ucaid.edu (198.32.8.14)  289.606 ms  305.312 ms
> > 285.545 ms
> >  6  ipls-kscy.abilene.ucaid.edu (198.32.8.6)  271.494 ms  324.436 ms
> > 329.555 ms
> >  7  clev-ipls.abilene.ucaid.edu (198.32.8.26)  309.116 ms  375.558 ms
> > 319.727 ms
> >  8  abilene.psc.net (192.88.115.122)  263.412 ms  312.156 ms  278.932 ms
> >  9  penn-state.psc.net (198.32.224.66)  252.412 ms  291.249 ms  238.552
> > ms
> > 10  * * *
> > 11  * * *
> > 12  * * *
> > 13  * * *
> >
> > This traceroute never completed - after some time I killed it. The
> > Abilene times are relatively slow - maybe latencies have been
> > accumulating for some time.  And, is something going on on your campus?
> 
> I don't think so... I checked with our campus networking people a little
> while ago about this problem and there were no problems out as far as PSC
> in Pittsburgh.  I think the traceroute return is getting stopped by the
> firewall at the entrance to the E&MS College here.  Any traceroutes you do
> will never make it past the firewall.  If that's a diagnostic pain, I can
> probably get our network admin to fix it to allow Unidata in.  Let me
> know.
> 
>                                     Art.
> 

Art,

If it's easy to do, it would be nice to allow us in.  It would be
helpful to get all the way to your site just as a data point when we're
doing such stuff.  

Regarding today, I can only identify Abilene as being relatively slow. 
How long have you been seeing such latencies?  And, I'd be interested to
know when you see these latencies go away (assuming that does actually
happen).

Anne
-- 
***************************************************
Anne Wilson                     UCAR Unidata Program            
address@hidden                 P.O. Box 3000
                                  Boulder, CO  80307
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