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RE: Issue with online NDT?


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  • From: "Casarez, Rick" <>
  • To: <>
  • Cc: <>
  • Subject: RE: Issue with online NDT?
  • Date: Tue, 25 May 2010 13:58:48 -0400

Hey Jason,

Apologies for not being specific. Yes, I am referring to the list of
servers on that page. Yesterday I did not have to go to that page
directly but used a link to the servers at:

http://www.measurementlab.net/measurement-lab-tools#ndt

But that page now looks different and does not have a link to the
servers but instead takes me to your NDT page.

I am accessing them form the Abovenet network and saw that yesterday the
servers were available through Equinix (via "Volox" I believe). However,
now when I do traceroutes I seem to be going through Cogent. Traceroute
is below:

rcasarez~/all $ tr 38.98.51.20
traceroute to 38.98.51.20 (38.98.51.20), 64 hops max, 40 byte packets
1 fw1 (209.249.254.155) 0.474 ms 0.431 ms 0.297 ms
2 11.ge-11-0-1.mpr4.iad1.us.above.net (172.17.205.3) 0.607 ms 0.565
ms 0.456 ms
3 xe-2-0-0.er2.dca2.us.above.net (64.125.31.118) 0.975 ms 0.905 ms
0.911 ms
4 xe-1-0-0.er1.dca2.us.above.net (64.125.27.21) 1.024 ms 0.977 ms
0.964 ms
5 xe-1-1-0.er1.iad10.above.net (64.125.26.238) 1.504 ms 1.547 ms
1.579 ms
6 te3-3.mpd01.iad01.atlas.cogentco.com (154.54.11.121) 1.669 ms
1.766 ms 1.681 ms
7 te0-0-0-2.mpd21.iad02.atlas.cogentco.com (154.54.1.41) 1.928 ms
te0-1-0-2.mpd21.iad02.atlas.cogentco.com (154.54.31.197) 1.898 ms
te0-2-0-2.mpd21.iad02.atlas.cogentco.com (154.54.31.201) 2.218 ms
8 te0-3-0-5.mpd21.dca01.atlas.cogentco.com (154.54.5.45) 2.632 ms
2.529 ms
te0-1-0-5.mpd21.dca01.atlas.cogentco.com (154.54.29.117) 2.427 ms
9 te4-2.mpd01.atl01.atlas.cogentco.com (154.54.28.225) 14.516 ms *
te7-2.mpd01.atl01.atlas.cogentco.com (154.54.1.225) 14.872 ms
10 te3-2.mpd01.iah01.atlas.cogentco.com (154.54.5.202) 44.171 ms
te9-2.mpd01.iah01.atlas.cogentco.com (154.54.2.222) 44.144 ms
te8-4.mpd01.iah01.atlas.cogentco.com (154.54.28.254) 47.061 ms
11 te9-2.mpd01.lax01.atlas.cogentco.com (154.54.0.229) 82.846 ms
84.281 ms 81.553 ms
12 vl3511.na31.b020604-0.lax01.atlas.cogentco.com (38.20.38.150)
82.947 ms 83.430 ms 82.407 ms
13 38.104.77.234 (38.104.77.234) 81.767 ms 81.698 ms 81.684 ms
14 38.98.51.20 (38.98.51.20) 81.283 ms 81.257 ms 81.252 ms

Are you aware of any changes in your route announcements for your
servers? I am checking our Cogent peering connections to see if there
were any changes but figured I would inquire here too.

Cheers,
Rick Casarez
Sr. IP Network Engineer
571.262.8709
-----Original Message-----
From: Jason Zurawski
[mailto:]

Sent: Tuesday, May 25, 2010 1:53 PM
To: Casarez, Rick
Cc:

Subject: Re: Issue with online NDT?

Hi Rick;

Can you be a bit more specific as to what problem you are seeing? Do
you mean this list:

http://www.internet2.edu/performance/ndt/ndt-server-list.html

The Internet2 network services are only accessible from R&E network
peerings, e.g. if you are trying to access these servers from a
commercial connection they will not work.

Thanks;

-jason

On 5/25/10 1:46 PM,

wrote:
> Hello,
>
> I tried this morning to run the NDT tool but it seems to web page has
> changed since yesterday and I now cannot run it. I clicked on the
> "Servers" tab but every server I tried on the top list just hung and
> did not work. Any advice would be appreciated.
>
> -Rick



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