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World IPv6 Day Results

June 9th, 2011 by

IPv6 Badge

Yesterday was World IPv6 Day and openSUSE participated in it. We hope the experiment was as successful for the other participants as it was for us!

Here is a short status update from the openSUSE infrastructure. openSUSE has currently two major server locations and we tested IPv6 at both separately.  Note that there are more openSUSE infrastructure locations, including the server which runs the popular planet.opensuse.org (which supports IPv6 as well now)!


In Nürnberg, Germany, the following main services were enabled:

  • download.opensuse.org
  • build.opensuse.org
  • lists.opensuse.org
  • {many_web_sites}.opensuse.org

Just two services did not make it in time: the torrent tracker and the email servers. Our current tracker software does not support IPv6 – and the dedicated new tracker needs more love from our packager. The mail servers are provided by our ISP so we left them as they were.

All our other services are RUNNNING on IPv4+IPv6 and WILL STAY on IPv4+IPv6 even if the IPv6 day is over now. We have seen an increase from ~1% IPv6 bandwidth usage to ~7% bandwidth usage today, which is impressive and encouraging!


In Provo, US, the following main services were enabled:

  • {lang}.opensuse.org wikis
  • forums.opensuse.org
  • lizards and news.opensuse.org

Currently these services provide IPv6, but we are facing two kinds of problems, proving how useful the World IPv6 day was for us:

  1. Native IPv6 users reported problems which are MTU related. Manually lowering the MTU on the client side fixed their problems, but this is something that we are working on closely together with our ISP.
  2. Some sites are not accessible from some clients. But clients from the same subnet did not have the problems. More mysterious: the problematic clients can reach other servers without problems. This is currently the problem which needs some deep investigation.

We are currently discussing whether we can solve these issues quickly or have to disable IPv6 again for our servers in Provo.

The following problems were solved during World IPv6 day:

  • One package on our openSUSE distribution needed patches: the apache2-mod_geoip package used on download.opensuse.org
  • we found two packages (vsftpd and torrent-seeder) which can’t handle IPv4 and IPv6 at the same time

In conclusion, the world IPv6 day participation showed openSUSE to be quite ready for IPv6 – and we will work on fixing the few problems we encountered.

I’d like to mention two people especially and thank them for their hard work, great help and enthusiasm:
Christian Deckelmann (who provides us with the needed infrastructure, resources and knowledge) and Marcus Rückert (who handled all the configuration changes and patches that are needed on our servers).

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2 Responses to “World IPv6 Day Results”

  1. Amos Jeffries

    We have vsftp running with IPv4+IPv6 here. The solution is to run it on a hybrid stack OS listening on the IPv6 port for both IPv6 and IPv4 traffic.

  2. cherev

    The ‘problem’ with testing IPv6 is that ‘helpful’ implementations along a route may translate addresses to IPv4 and then back to IPv6 in order to fulfill a request.

    Dual/hybrid stack OSes will need to be implemented for years to come in Internet relay nodes and POPs in order to serve impecunious and clueless persons around the Earth.

    What an IPv6 effort can enable is implementing better security and anonymity for political dissidents, and for real financial and medical privacy. Why not do it right this time, and shaft the American Imperium, and the Red Chinese and Syrian thugs in the process ?