ndt-users list created

[Jason Zurawski <>]

Hey Rick;

If you are able to reproduce that would be great.  I will start a 
separate thread with MLab operations so we can pursue this further and 
CC you.

Thanks;

-jason

On 6/1/10 4:20 PM, Casarez, Rick wrote:
> Jason,
>
> When we traced to the CA server we did not trace to the URL. We actually
> took the IP address displayed when the test was run. For this particular
> test it did not go to 38.106.70.173 but actually went to 64.9.225.154.
> We noticed this since our delay times were over 100ms.
>
> We have not been able to reliably replicate this issue. I seem to always
> hit the NY server but my co-worker sometimes hits the CA one. In each
> case at the top of the web site it does state that the server is located
> in New York. Even if it goes to the CA one.
>
> Cheers,
> Rick Casarez
> Sr. IP Network Engineer
> 571.262.8709
>
> -----Original Message-----
> From: Jason Zurawski 
> [mailto:]
> Sent: Tuesday, June 01, 2010 4:00 PM
> To: Casarez, Rick
> Cc: 
>
> Subject: Re: Warning for those using tool off of measurementlab.net
> website
>
> Hi Rick;
>
> I don't represent MLab but I do work with them in their deployment of
> NDT.  The system they are using to handle the redirecting of servers is
> called 'DONAR', it tries to find the closest server to test against.
> When you click the link on the MLab page (I think the link is
> http://ndt.iupui.donar.measurement-lab.org:7123/ - this is a real server
> in CA) DONAR will transparently redirect you to the best server.  If the
> server shows up as being in New York on the HTML this is correct, the
> URL may not change in the bar when this happens (so your traceroute to
> the URL will still go to the dummy server in CA).  See attached picture.
>
> Does this address your question?  If you do have evidence that the
> redirect is not working properly I would be happy to put you in contact
> with the MLab support staff to rectify the problem.  Thanks;
>
> -jason
>
>
> On 6/1/10 3:48 PM, Casarez, Rick wrote:
> > All,
> >
> > Users used to be able to choose which server they wanted to hit. Now
> > the website is coded so that the server you go to is chosen
> automatically.
> > However, this function is not working correctly. We had someone in VA
> > click on the tool, it said it ran the test to a MLab server in New
> > York but the IP address actually traced to their server in California.
>
> > Not sure why they changed it, being able to choose the server helps
> > tremendously.
> >
> > Cheers,
> >
> > Rick Casarez
> >
> > Sr. IP Network Engineer
> >
> > 571.262.8709