I just booted the 23 Sep 2010 daily Maverick build and thoroughly tested
the network manager.  By default, the settings don't match the dialog,
but after changing the settings, all works well.  What I mean by this is
that by default, the IPv6 setting is to ignore.  But it doesn't ignore
(I got an address).  After setting the IPv6 settings to automatic and
leaving the 'Require IPv6' checkbox checked, I was still able to get a
connection even without IPv6 available.  I unchecked the box and all
worked.  Then I checked the box and my connection failed without IPv6
enabled.

Setting        | IPv6 required | IPv6 not required
--------------------------------------------------
IPv6 available | IPv4 OK       | IPv4 OK
IPv6 not avail | no connection | IPv4 OK

My conclusion is that while the initial settings still allow IPv6
despite what the dialog says, this bug is no longer an issue.  Someone
can open a bug for the initial settings if it is that bad.  If this bug
is targeted for Maverick, then it can be closed.

For those who care, I have attached a screenshot of the Maverick network
manager settings dialogs.

** Attachment added: "Screenshot of the Maverick IPv4/IPv6 settings"
   
https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/284874/+attachment/1630100/+files/ipv4-ipv6-settings.png

-- 
IPv6=automatic breaks IPv4
https://bugs.launchpad.net/bugs/284874
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