Request for assistance for halo.sci.ccny.cuny.edu

Dear Bob,

I got your email address from Kwan-yin Kong who works for Professor
Hindman at CCNY.  I am trying to help Kwan debug a problem with his LDM
software on halo.sci.ccny.cuny.edu.  The symptom is that the LDM is
unable to connect outside the local network.    

I can ping the remote site to which halo is trying to connect,
striker.atmos.albany.edu. I would like to try a traceroute from halo to
the outside, but halo apparently does not have traceroute installed.  In
a traceroute to halo from here (in Boulder) I get this:

/local/ldm% traceroute halo.sci.ccny.cuny.edu
traceroute to halo.sci.ccny.cuny.edu (134.74.52.189), 30 hops max, 40
byte packets
 1  flra-n140 (128.117.140.252)  0.451 ms  0.287 ms  0.266 ms
 2  gin-n243-80.ucar.edu (128.117.243.81)  0.503 ms  1.313 ms  0.633 ms
 3  frgp-gw-1.ucar.edu (128.117.243.34)  1.553 ms  1.613 ms  1.881 ms
 4  ucar.edu.ip.att.net (12.124.158.13)  1.544 ms  1.918 ms  2.777 ms
 5  gbr1-p60.dvmco.ip.att.net (12.123.36.138)  2.280 ms  1.654 ms  1.358
ms
 6  gbr4-p70.dvmco.ip.att.net (12.122.5.21)  2.117 ms  2.641 ms  2.442
ms
 7  gbr4-p80.dlstx.ip.att.net (12.122.2.101)  22.258 ms  22.214 ms 
23.772 ms
 8  gbr3-p60.dlstx.ip.att.net (12.122.1.137)  23.423 ms  22.280 ms 
22.587 ms
 9  gbr4-p40.attga.ip.att.net (12.122.3.38)  35.924 ms  38.660 ms 
37.211 ms
10  gbr4-p10.wswdc.ip.att.net (12.122.2.162)  51.867 ms  50.795 ms 
51.075 ms
11  gbr3-p60.wswdc.ip.att.net (12.122.1.129)  50.960 ms  51.033 ms 
50.838 ms
12  gbr3-p20.n54ny.ip.att.net (12.122.3.53)  56.778 ms  56.819 ms 
56.811 ms
13  gbr1-p100.n54ny.ip.att.net (12.122.1.150)  55.335 ms  55.198 ms 
54.953 ms
14  gar1-p360.n54ny.ip.att.net (12.123.1.129)  55.422 ms  55.501 ms 
56.049 ms
15  12.125.51.210 (12.125.51.210)  56.903 ms  56.888 ms  57.614 ms
16  at-cpe-cuny.appliedtheory.net (169.130.253.130)  56.726 ms  56.798
ms  56.806 ms
17  128.228.179.52 (128.228.179.52)  57.657 ms  58.177 ms  57.614 ms
18  128.228.179.17 (128.228.179.17)  59.523 ms  58.141 ms  58.169 ms
19  128.228.91.38 (128.228.91.38)  59.296 ms  59.252 ms  60.533 ms
20  * * *
21  * * *
22  * * *
23  * * *
24  * * *
25  * * *
26  * * *
27  * * *
28  * * *
29  * * *
30  * * *

I was wondering if perhaps there was a firewall blocking traffic on port
388, but I understand from Xiaodong Yan that port 388 is open in both
directions.  However, the last hops on the traceroute indicate either a
firewall or an extremely slow connection.  Do you know which it would
be?  And, I can't resolve the IP addresses to any name, although I'm
guessing that they are part of the CUNY network.

Then I wondered if perhaps the IP address on halo has changed.  Would
you know if that was the case?

Also, today I came across a very interesting situation.  The
telecommunications people on a particular campus had installed software
to throttle file sharing.  (It was called Packeteer/Packetshaper.) 
Turns out that this software caused the LDM to relay at extremely slow
speeds, or not relay at all.  Are you using any such software?

Or, do you have any other ideas regarding why halo's LDM can't connect
to the outside?

Thanks very much for your time!

Sincerely,

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