Comment 36 for bug 24828

Thomas, perhaps I don't understand very well the features of ipv6 that you mention. If it was just a matter of additional features, then the solution would be the same as with providing compiz or beryl by default: even if the scale (OSX exposé alike) plugin is really an usability aid, since it shows you all the windows at once, and moreover desktop effects are a good publicity for a linux distribution now that both OSX and Vista have them, ubuntu will not ship compiz by default since it might break things for people having broken opengl support in their video card. I have a card supported by open source drivers and have no such problems, but will not demand compiz by default on ubuntu because I want all newbies to be able to use ubuntu, and don't want them to see a "broken" thing at installation.

The examples you mentioned are university and business, and in both cases you will have a sysadmin or at least basic networking instructions telling you that ipv6 is useful and advising you to enable it. It seems like home users won't really need ipv6 and won't have anyone telling them to check whether ipv6 is breaking things or not - in general. If every case was like that, there would be no reason to enable ipv6 by default. The example brought by Fabio is really interesting: he has a home provider that needs ipv6 enabled. The question is: did they warn you, in their initial instructions, that you needed to enable ipv6? In general, it still seems to me that a provider requiring ipv6 is something rare w.r.t. a provider breaking with ipv6.