perfSONAR User Q&A and Other Discussion

[Jason Zurawski <>]

Greetings;

The pS Performance Toolkit relies on accurate timing information provided by NTP software to ensure that measurements such as OWAMP and BWCTL function properly.  As many of you know, we feature a GUI 'wizard' to help the community select several public servers to deliver this accuracy.  After the recent emphasis on the NTP Amplification attack, we have found that several previously public NTP time sources have been blocked, which does limit the number of choices users can rely on to ensure their systems are synchronized (see screen shot below).  

We are writing to ask for community assistance in identifying new servers to load into our configuration scripts.  If your network or campus does still run a public time source (e.g. one that is available via the R&E routing table) and you don't mind users synchronizing on a regular basis, we would ask that you get in touch with us.  This assistance would be very valuable as the number of deployed toolkit instances grows, and we would like to identify servers in different parts of the world (in particular, Europe, Asia, South America, and Africa do not have heavy coverage).  

If you believe you can be of assistance, please respond to '' with the name of your server, and we can add it to the list.  

Thanks;

-jason