I don't think that's going to completely solve the problems with IPv6
and NM, unfortunately. It seems that when NM doesn't get a router
advertisement for IPv6 in a relatively short timeframe, it fails the
entire connection, even if it got an IPv4 address. Where that ties into
this bug is that if (by some miracle) NM got the router advertisement in
enough time, it wasn't flushing the configuration when the interface
went down and the *next time* the interface came up, problems would
ensue - and the problem would seem to change faces depending on whether
a router advertisement hit the listening window again. Sometimes you
would seem to have a valid IPv6 config that worked and sometimes you
would seem to have a valid IPv6 config that didn't.

The problem is, this bug doesn't define the problem well enough anymore.
Right now, I have IPv6 set to "Ignore" for my home network even though
my router still sends out IPv6 advertisements. I still get an IPv6
address for the interface, though, and it's a crapshoot whether the
configuration will actually work. If I set NM to "Automatic" for the
IPv6 on this connection, it most often fails because a router
advertisement does not get through in the brief window that NM is
actually listening for one. The real problem is that IPv6 is unreliable
in NM, *period*, and it's not always possible to know what your network
setup currently is with it.

-- 
IPv6 configuration is not flushed when interface goes down
https://bugs.launchpad.net/bugs/215497
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