You are here: Home > Participate > Join a Discussion > Mailman Archives

Re: [Fwd: RIPE56 tt-wg minutes]

Dear All,

Please find below the draft minutes of the TT-WG session at RIPE 56.
Thanks to Rene for producing them.  Comments to the list please,
I didn't put a timer in my request for comments, but since there hasn't
been any discussion on these minutes, I suggest to declare them final.


Ian & Henk

- - -

Test Traffic Working Group Minutes from RIPE 56

RIPE Meeting:      56
Working Group:     Test Traffic
Status:     Draft

Co-chairs       Ian Meikle and Henk Uijterwaal
Scribe          Rene Wilhelm
Jabber          Henk Uijterwaal

A. Administrative Matters
    * Welcome
    * Select a scribe
    * Jabber Monitor
    * Microphone Etiquette
    * Minutes from working group session at RIPE 55
    * Finalise agenda

B. New Working Group Chair - Ian Meikle, Nominet

Working for Nominet, Ian volunteered to become the tt-wg chair in response to the call for new chair made at the RIPE55 meeting. His primary interests are with the applications built on top of TTM, such as DNSMON. However, more generally he is also intereseted
to know how systems operate, how they connect.

C. IETF IPPM Working Group Update - Henk Uijterwaal, RIPE NCC
Henk presented the work the IETF IPPM group has accomplished over the 
last 10 years.
Although some items are still progressing and IPPM have a few other 
things on their
plate, all in all there isn't that much work left; the group is reaching 
the end
of its current charter. At the next IETF, in Dublin, Ireland, IPPM will 
discuss the
options for future work items and associated changes to the charter. To 
have a broad
discussion, IPPM are seeking input from the community. If you have 
ideas, suggestions
for the group, do not hesitate to step forward: contact any of the IPPM 
chairs or send
comments to the [email protected] mailing list.

There were no questions.

D. ccTLD Use of DNSMON - Ian Meikle, Nominet

Ian showed how Nominet, the registry for .uk, use the DNSMON service to augment their own monitoring system based on Nagios. At the beginning of each month, they check the DNSMON graphs to verify how the name servers had been performing the previous month. Because DNSMON probes the name servers from different vantage points, it can distinguish between problems with the nameserver itself and problems further upstream in the network (when a server is reachable from some but not all monitoring probes).

Daniel Karrenberg (RIPE NCC) commented the graphs shown must have been created long after the events took place; the resolution on the time axis is very coarse. Becasue
data are kept in an RRD database, the granularity changes as time goes by.
Ruben van Staveren (RIPE NCC) confirmed: for the first 30 days resolution
is 1 minute, then 100 days at five minutes, and then 400 days at one hour.
Ian was advised to check more frequently to get most fine grained time resolution.

E. Available Bandwidth Measurements - Andrei Shukhov
Andrei Shukhov addressed the tt-wg meeting from Samara, Russia via 
Andrei presented the  work on estimating available  bandwidth by 
measuring delays of
differently sized packets.


Daniel Karrenberg (RIPE NCC) enquired about verification of the results.

Andrei replied the methodology had been tested with the ping utility; the results are comparably to those obtained with (more intrusive) iperf tool on an unloaded link. It could not yet be tested on TTM boxes because those miss an easy interface
for measuring different packet sizes.

F. TTM Network Update - Ruben van Staveren, RIPE NCC
Ruben gave an update on developements in the TTM network and service 
during the
last 6 months. More nodes have been added and are in progress of being 
No questions.

G. TTM Futures Update - Mark Dranse and Franz Schwarzinger, RIPE NCC
Mark and Franz presented the new structure and new features of TTM service.
The pricing structure has been fixed, the concept of a sponsored node
has been formalized in document RIPE-430. In terms of service, the additions
are a plug-in based platform for ad-hoc measurements and an upgraded,
innovative three stage system for TTM alarms.


The question was raised if instead of developing plug-ins, a plug-in based interface, it wouldn't be better to make an API description and have the ad-hoc testing run as
open source. That way RIPE NCC would get more input from the community.

Franz replied there are no plans now to open up and give it to the community. However, if the test-traffic working group wants it, it could, technically, be possible.

Ian Meikle queried how the four test-boxes which reported results in the ad-hoc testing demo were selected.
Franz replied that for the demo, boxes involved in the test were 
randomly selected from the four regions, Europe, Asia, North America, 
South America. In the next weeks, the user interface will be enhanced, 
such that users can select the boxes they want to use for a measurement.
Z. A.O.B

No other business.


Henk Uijterwaal                           Email: henk.uijterwaal(at)
RIPE Network Coordination Centre
P.O.Box 10096          Singel 258         Phone: +31.20.5354414
1001 EB Amsterdam      1016 AB Amsterdam  Fax: +31.20.5354445
The Netherlands        The Netherlands    Mobile: +31.6.55861746

Is one of the choices leaving the office open?
                                      Alan Greenspan on the next elections