ndt-users list created

[Richard Carlson <>]

Hi Matt;

OK, that explains why you can't get to the Abilene servers.

I just downloaded the 3.1.4b tarball from the e2epi web page and unpacked 
the tar ball.  I then did the following
rcarlson@nmsy-aami$
 cd src
rcarlson@nmsy-aami$
 gcc -oweb100clt web100clt.c
rcarlson@nmsy-aami$
 ./web100clt mirnada.ctd.anl.gov
Error, NDT server name/address not supplied
rcarlson@nmsy-aami$
 ./web100clt miranda.ctd.anl.gov
Testing network path for configuration and performance problems
Checking for Middleboxes . . . . . . . . . . . . . . . . . .  Done
running 10s outbound test (client to server) . . . . .  23.48 Mb/s
running 10s inbound test (server to client) . . . . . . 71.58 Mb/s
The slowest link in the end-to-end path is a 100 Mbps Full duplex Fast 
Ethernet subnet
Packet size is preserved End-to-End
Server IP addresses are preserved End-to-End
Client IP addresses are preserved End-to-End
rcarlson@nmsy-aami$
 uname -a
FreeBSD nmsy-aami.abilene.ucaid.edu 5.4-RELEASE FreeBSD 5.4-RELEASE #0: Wed 
Oct 26 20:20:34 UTC 2005     root@:/usr/src/sys/i386/compile/OWAMP-SC05  i386

As you can see, the client built successfully and the test ran correctly.

So the question is, what is different on your host?  What OS version are 
you using?  Is there a firewall or other filter in the path?  The client 
uses TCP ports 3001 (control channel), 3002 (client to server test), and 
3003 (middlebox and server to client test).

The broken pipe message in your previous email seems to indicate that 
traffic isn't flowing over port 3002.  Can you trace this, say with 
tcpdump, or look at the system stats (netstat -nat) to see what is going on.

Right now I'm at a loss.  Anyone else have any suggestions?

Rich

At 04:34 PM 7/19/2006, Matt Selsky wrote:
> On Jul 19, 2006, at 3:21 PM, Richard Carlson wrote:
>
> > > With ndt-3.1.4b and the NY server:
> > >
> > > $ ./web100clt -dddddd -llllll ndt-newyork.abilene.ucaid.edu
> > > Testing network path for configuration and performance problems
> > > Connect() for control socket failed : Operation timed out
> >
> > OK, this is saying that you can't access the servers inside
> > Abilene.  Apparently the host you are trying from isn't able to
> > access the Abilene network.  I can ping the Columbia University web
> > server, are you able to ping/traceroute to the NDT server?
> >
> > Can you reach any of the public NDT servers listed on the e2epi web
> > page?
>
> The machine I'm testing isn't at Columbia.  It's on the regular
> internet at a site in Canada.  The public NDT servers, like ANL, give
> me the "Broken pipe" error.
>
>
> --
> Matt

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



Richard A. Carlson                              e-mail: 

Network Engineer                                phone:  (734) 352-7043
Internet2                                       fax:    (734) 913-4255
1000 Oakbrook Dr; Suite 300
Ann Arbor,  MI  48104