perfSONAR User Q&A and Other Discussion

[Aaron Brown <>]

Hey Alan,

There’s a poorly documented (read: not documented) way of doing that for 
traceroute (doesn’t work for tracepath, but will when I do another release), 
if you specify “-y a”, it’ll skip the hostname checks. Presumably, I chose 
‘a’ for ‘addresses’ or something.

Cheers,
Aaron

On Mar 27, 2014, at 1:54 PM, Alan Whinery 
<>
 wrote:

> One nit, after spending some time messing about with bwctl 1.5.1 --
> 
> The existence of a "-n (number of tests)" arg in bwtraceroute
> effectively masks "-n (don't do name resolution)" in tracepath and
> traceroute. With many (most?) paths including a hop with some proportion
> of hops with no associated reverse DNS record, doing name resolutions
> can increase the trace* time-to-complete by several orders of magnitude,
> so it's good to be able to send traceroute/tracepath a "-n".  This
> creates issues when the extra time stacks up across multiple traces, and
> if you really want names at some point you could resolve them from the
> collected IP addresses.
> 
> I suggest adding a bwctl switch which tells the tool in question to
> not-resolve, not necessarily "-n" itself, like "--no-dns" .
> 
> On 2/18/2014 8:11 AM, Aaron Brown wrote:
>> Hi all,
>> 
>> A new version of BWCTL is now available. BWCTL 1.5.1 is a major upgrade 
>> over the previously released version.
>> 
>> Notable additions in this release:
>> - Support for ping and owping (Run 'bwping -h' to see the available 
>> options)
>> - Support for traceroute and tracepath (Run 'bwtraceroute -h' to see the 
>> available options)
>> - Support for iperf3, and improved support for nuttcp
>> - Support for working behind a firewall for iperf3, ping, traceroute and 
>> tracepath (use the "--flip" flag when the receiver is behind the firewall)
>> - Handles NTP unsync a bit better (the daemon start, but will deny tests 
>> until NTP is synchronized)
>> 
>> Those who are using the perfSONAR Toolkit, or otherwise have the Internet2 
>> RPM repository enabled, can run 'yum update' to get the latest changes. 
>> For those who are installing from source or prefer to install the RPMs 
>> manually, the newest version can be downloaded from 
>> http://software.internet2.edu/ . After installation, you will need to 
>> restart bwctld to use the new features. You can do this by running 
>> “/etc/init.d/bwctld restart”.
>> 
>> Please let us know if you have any questions and we look forward to 
>> everyone's continued feedback and support!
>> 
>> Thank you,
>> The perfSONAR-PS Development Team
>