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If you know of any issues that customers might encounter during the transition to IPv6, please add a subheading to this page and explain both the problem and how to address it.

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Broken users unable to access dual-stacked content

A small number of users have some kind of misconfiguration or bug in their internet connection that makes them unable to properly access dual-stacked web sites. More often than not, these users have no problems accessing IPv4-only sites, which causes them to perceive the dual-stacked site as the one having problems. A web site operator can detect these users using JavaScript and potentially warn them about the problem, see Warning broken users with JavaScript.

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If you do deploy an IPv6 network for your content, set up a Teredo relay, and point 2001::/32 at it. Your viewers/users will automatically use this relay when accessing your content, and their traffic to you will be over IPv4, all they way from their PC to your network - so, equivalent performance as IPv4. Note that I say relay here, not server.

Mozilla.org are doing this for example. Cue Matthew Zeier.
--Nathan Ward

Check out  Enabling IPv6 on a Mail Server‎.

Unfortunately, not all Domain Registrars are providing IPv6 Glue yet

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