- IPv6 news and information

IPv6 Query is one of the very first iPhone applications that can resolve IPv6 Addresses. Because the high level iPhone SDK classes provided by Apple do not support IP version 6, they can not resolve host names. IPv6 Quert uses C to resolve DNS instead of the Cocoa
classes that refuse to return IPv6 addresses.

The app created by infinitycg will let you test host names for IPv6 support and also provides reference material.

The app costs $0.99 in Itunes and can be found under the Utilities categorie

Erion’s David Holder is to speak at this year’s SambaXP conference in Göttingen, Germany. The paper entitled “How to Implement Samba in IPv6 Windows Server 2008 and Windows 7 Networks” will provided detailed guidance on migrating heterogeneous networks to IPv6 using Samba. Details of the Samba XP agenda can be found at http://www.sambaxp.org/index.php?id=154.

Erion has been instrumental in the IPv6 enabling of the popular Windows and Unix integration open source package Samba. We were the first to successfully IPv6 enable the Linux CIFS client, Samba 3.2 and Samba4. In addition, we carried out the first IPv6 SMB connections between Samba and Windows Server 2008. Further information on Erion’s work with Samba and IPv6 can be found on our IPv6 blog at http://www.ipv6consultancy.com/ipv6blog/?cat=4.

SambaXP runs from 5th  May to 6th May 2010.

mDNSResponder, used for all DNS queries in Mac OS X 10.6 Snow Leopard, has a strange behavior when it comes to query DNS records.
It will simultaneously ask for a A and a AAAA record when performing a DNS lookup but will be only using the first response and will reject any further responses with a “port unreachable”.

For example. You are using a dual stack client and want to browse to a dual stack website. The mDNSResponder will send a A and a AAAA request. The DNS server will respond to both queries but the client only uses the responds that it receives first. If for example the A record is received first you will be using a IPv4 connection even though you are dual stacked.

Stuart Cheshire gave a presentation on IPv6 adoption at the IETF 72 Technical Plenary. In that presentation he explains the motivation behind this double query.

Initially, from a end user perspective, it is a nice idea that could have its benefits, but if you look u bit further it has many downsides to it. Some are: Harder to debug on your network. DNS servers get twice as much queries. It will not work when your client is on a IPv6-only network and, even more troubling, if you only have a AAAA record the responds to the A record request will result in a NXDOMAIN and the client thinks the domain doesn’t exist.

So be aware of this behavior when working with MacOS X 10.6 (and perhaps other Apple products) and keep an eye on the bug report.

A list of the most popular Dutch websites according to Alexa.com. We left out the websites that are not from the Netherlands.

There are 6 websites that are reachable by IPv6. But only 3 are dualstack on the main domainname. These websites are www.geenstijl.nl, www.spitsnieuws.nl and www.spele.nl.

Two of the 3 websites with dualstack IPv6 are hosted by Prolocation that offer IPv6 connectivity by their IPv6 Proxy

We will keep checking the list to see if more websites become reachable by IPv6.

The list:

Website	IPv6 on Domain	IPv6 on Subdomain	URL
hyves.nl
nu.nl
marktplaats.nl
telegraaf.nl			http://www.ipv6.telegraaf.nl
ing.nl
startpagina.nl
nos.nl
rabobank.nl
dumpert.nl
abnamro.nl
bol.com
funda.nl
tweakers.net
rtl.nl
geenstijl.nl			http://www.geenstijl.nl
fok.nl
buienradar.nl			http://www.buienradar.nl/
spele.nl			http://www.spele.nl
tvgids.nl
spitsnieuws.nl			http://www.spitsnieuws.nl
detelefoongids.nl
vi.nl
ad.nl
omroep.nl
nusport.nl
partyflock.nl
volkskrant.nl
upc.nl
web-log.nl
wehkamp.nl
ns.nl
ebay.nl
beslist.nl
kieskeurig.nl
anwb.nl
speurders.nl			http://www.ipv6.speurders.nl
9292ov.nl
uitzendinggemist.nl
voetbalzone.nl
nrc.nl
kpn.com
xs4all.nl			http://www.ipv6.xs4all.nl
knmi.nl			http://www6.knmi.nl
t-mobile.nl
dvhn.nl
belastingdienst.nl
nujij.nl
ah.nl
vodafone.nl

A few hours ago Opera released the final of Opera 10.50. With this release Opera has fixed a big IPv6 problem.
In previous releases the Opera webbrowser unconditionally preferred IPv6 over IPv4, even if the IPv6 connection was for example a Terredo connection. With this new release Opera complies with RFC3484 and only prefers IPv6 if that connection is native.

The effect that this bug had has been made available by Tore Anderson by including 1×1 pixels over dual stack and IPv4-only on a high traffic website located in Norway. In his latest Februari report there is a IPv6 brokenis of 0.094% and if you exclude Opera it’s 0.029%. Reports are available for October, November, December, Januari and Februari.

Some websites, including Google, don’t offer a AAAA DNS record because of this small portion of customers (but many users if you are a large content provider) they would lose when introducing a AAAA record. Instead they offer something like ipv6.domain.com or in the case of Google set up a whitelist program.  Opera, like most browser, offers upgrades without intervention of the user so this new release should be adopted soon by Opera users. Let’s hope this will inspire content providers to include AAAA records without any limitations. The browsers are ready.

Thanks to Tore Anderson for making these reports available.

Four months ago we reported that the AMS-IX achieved 2 Gbps of IPv6 traffic. Since then there hasn’t been much growth of IPv6 traffic at AMS-IX.
The Gemand Internet Exchange (DE-CIX) however has seen a steady increase of IPv6 traffic (as well as IPv4) these last few weeks and as of today broke the 2 Gbps barrier with 2.14 Gbps of IPv6 traffic.

The total peak traffic at DE-CIX today was 1240.4 Gbps of which 2.14 Gbps was IPv6, that is 0.172%. These days the AMS-IX also has 0.172% of IPv6 traffic, this is unfortunately less the the 0.285% we reported back in October 2009.