perfSONAR User Q&A and Other Discussion

[Craig Finch <>]

I'm experimenting with a pair of perfSONAR nodes on an isolated network.  
They have valid Internet IP addresses, but they don't have any access to the 
outside world.  I have noticed a couple of issues while testing the nodes 
under this configuration, and I suspect that others will try a similar 
experiment and run into the same issues.  

1. I had to add the host IP address to the file 
/opt/perfsonar_ps/toolkit/etc/external_addresses in order to establish 
communication between the two perfSONAR nodes.  

2. I was able to schedule a ping test between the nodes, but I am unable to 
plot the data.  I go to "Ping Latency" under "Service Graphs" to access the 
"PingER Tests" page.  This page shows an active data set.  When I try to 
graph the data, a new window opens up, but it doesn't contain a plot.  It 
appears that the server is trying to access a web application from google.com 
in order create the graph.  Is that what's happening? Is there a way to see 
the data without Google?  I think the one-way latency and bandwidth 
measurements have the same problem.

Craig Finch
Postdoctoral Research Associate, STOKES Advanced Research Computing Center
Institute for Simulation & Training
University of Central Florida
3100 Technology Pkwy., Orlando, FL 32826-0544
407-823-0711