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NetNews Minutes

Minutes from the NetNews Working Group Session at RIPE 24

Netnews Working group
Minutes of the 1st meeting in Berlin, April 22, 1996

Chair: Felix Kugler
Scribe: Felix Kugler

0. Introduction

Welcome to the first meeting. The participants list was passed, there
were 21 attendees. Nobody wanted to risk being scribe and it took some
time to find a "volunteer'. Unfortunatly, it was impossible later on
to get the notes. The minutes are now based on the chair's sparse notes.

There were no changes proposed to the agenda.

1. News traffic analysis

Felix Kugler presented a number of slides showing how News traffic
grew from March 95 to March 96, both in terms of articles (+40%) and
data volume (+400%). Measurement point was a SWITCH News server. The
alt hierarchy now dominates News traffic with approx. 85% of the total
volume, and it has by far the highest growth. The daily traffic
pattern shows that still most articles originate in US. We see
traffic peaks during US-"active hours" corresponding to night to
mid-morning in Europe. Interstingly, weekend data volumes are much
higher nowadays and the average article size is significantly higher
at those times. Slides are available from
ftp://ftp.switch.ch/info_service/netnews/wg/ripe24/nnwg-slides.ps.gz.

Conclusion: News traffic is growing at a breathtaking pace and adds up
a considerable amount of the total traffic of a typical network. The
lion's share of News volume is in the alt hierarchy. The good news is
that Netnews traffic peaks at times where Europeans use less bandwidth
for interactive work.

1.2 Analysis of today's News distribution paths

Heiko Rupp (XLINK) presented the model of his path analysis system. A
number of well connected sites define a special channel on their News
server which pipes header information of every incoming News article
into a Perl script. The script parses the Path:-header line and fills
a database of transmitted articles between adjacent news servers. An
extract of this database is sent to Heikos workstation on a regular
basis where the data is combined and analyzed. Fancy scripts create
Postscript maps automagically. The resulting maps are available on
Xlink's WWW server. They are considered examples only because only
three measuring sites - located at XLINK (DE), SWITCH (CH), and
University of Pisa (IT) - were used for the prove of concept.

This work got much attention. Heiko will improve his scripts and
announce them when ready. He takes care that no patches on the
installed news server software is needed which would make the package
difficult and dangerous to install.

Two potential weaknesses were pointed out: the maps are based on the
article count and not on the transmitted data volume which is
considered more important for the underlying network, furthermore the
graphs ado not show the direction of newsflow. It was decided to stick
with what we have now and make this operational. In a later phase the
package could be enhanced to address the problems mentioned before.

Three additional ISPs volunteered to install and run the scripts for
"production": ACONET (AT), DEMON (UK), TELIA (SE). For a reasonable
coverage, more measuring sites will be needed. This can be
accomplished offline.

In the "production phase", data shall be collected once per week. More
details will be announced later. Heiko's slides are available from
ftp://ftp.xlink.net/pub/news/docs/ripe24-netnews-wg.tar.gz.

2. Minimizing Netnews resource usage

2.1 Transatlantic newsfeeds

It was agreed that avoiding waste of transatlantic bandwidth has top
priority. Low latency interconnections between European endpoints of
US-feeds shall minimize multiple transmission of articles over the
expensive transatlantic links.

In fact, part of this News Backbone already exists, and it even
crosses the boundaries of the "big" European service providers.
Unfortunatly, the latency is in many cases clearly too high, mostly
due to overloaded News servers and links. There are only few servers
with online monitoring facilities so that the performance of many
servers often can be guessed only after a certain time when local
statistics are available.

Based on the newsflow maps and "human experience" the newsfeed
topology should be improved and a News backbone be realized. As soon
as this fast European News Backbone works well and reliably, a
reduction of the number of US-feeds can be considered.

Gerhard Winkler (ACONET) points out the value of local peerings
because bandwidth costs are negligible in most cases. However, local
peerings might be difficult to arrange for competitive considerations
when the newsflow between the peers is heavily unbalanced.

2.2 coordination of intra-ISP News distribution

It was tried to get an idea from the attendees how News is distributed
within the international ISP's networks. The resulting picture is very
incomplete and to be interpreted with caution.

DANTE: No managed News service so far but plans to start a project.
Central NRN's with multiple international links usually have
good, bilaterally coordinated newsfeeds, single attached NRN's
have more problems to get feed.
Contact: Felix Kugler, SWITCH

EBONE: No managed News service, no central coordination. It is reported
that the informal coodination works well and that every
connected network can get a full feed for free from a
neighboring network.
Contact: Gerhard Winkler, ACONET

PIPEX: Runs several News servers so that there is usually only one
feed on an international link.
Contact: Mark Turner, PIPEX UK

The contacts mentioned above do not necessarily denote responsible
persons, but usually well informed people.

2.3 other methods to save resources

Dropping newsgroups/hierarchies with excessive volumes (all kind of
binaries) is considered a bad move though pushing binary stuff onto
ftp/WWW-servers would be a reasonable goal. The problem is how to
filter out binaries. The obvious first approach would be to filter
based on the newsgroup name. However, binaries are often posted to
non-binary groups exactly to bypass such newsgroup exclusions.
Filtering based on article size will most probably not work either. It
just leads to smaller but more fragments and reduces the probability
that a binary gets transmitted completly, thus triggering numerous
"please repost" requests.

Mikael Kullberg (TELIA) remarks that it was probably a mistake to
enlarge the maximum fragment size on Usenet from 64kB to typically 1MB.
It is probably not possible in practice to go back to smaller
fragments in a coordinated way, so we have to live with the big
fragments we have now.

The use of intelligent (dynamic) servers and proxies is considered
interesting for leaf sites. It is not a topic for the WG at the
moment.

3. Making the backbone more reliable - News backbone server requirements

There was only a short discussion due to time shortage. This topic is
to be pursued on the netnews-wg list after the meeting. There was
consensus that the following issues should be tackled:

- latency goals
- minimum expire period
- minimum set of newsgroups
- control message handling
- handling of national/regional hierarchies
- status monitoring facilities

Some sites already have online-monitoring facilities in place. The following
were mentioned at the meeting:

PIPEX: WWW-interface (ex: http://www.oleane.net/news/vol/)
SWITCH: VT-100 based (ex: telnet scsing.switch.ch, login: shownews)

A list of News servers with available monitoring information is
planned to be setup after the meeting.

4. Tools

This agenda item too was postponed due to time constraints. It was
pointed out that Dave Barr maintains very complete INN pages on his
WWW server with a bunch of useful tools. Check
http://www.math.psu.edu/barr/INN.html for more info.

innfeed, a new INN backend program, is now in beta-phase. Though it
still has some etches it is considered an important improvement over
today's nntpsend/nntplink programs. It will be part of future INN
releases.

5. The future of Netnews distribution

Apart from improvements of the current News transmission technology,
fundamentally different ways to transport News are possible. Keywords
are satellite transmission and IP multicast.

Satellite transmission is already in use at least in the US, but none
of the attendees had detailed knowledge or experiences about this.

Heiko Rupp (XLINK) gave a short introduction about News transport via
IP multicast. UUNET obviously has experimented with this technology
some time ago, but gave up for the moment due to limitations in their
implementation (a 9kB size limit imposed by UDP code) and the fact
that no reliable multicast network is in operation yet. There was a
presentation on a USENIX conference about their system. Check the
document "Drinking from the Waterhose" by K. Lidl and J. Osborn,
http://www.va.pubnix.com/staff/stripes/muse/usenix-muse.ps.gz for
detailed info.

6. Central info point for Netnews distribution

This agenda item was dropped. The WG will take care of this as soon as
there is a need for an info point.

7. Closing

The netnews WG is likely to meet again at the next meeting, but a
final decision is postponed.