IPv6 broken on Fedora 20?

[Hannes Frederic Sowa]

On Thu, Dec 19, 2013 at 05:59:45PM +0100, Tore Anderson wrote:
> * Simon Perreault wrote:
> 
> > Is there any other Fedora user on this list that could confirm this?
> 
> I can confirm that SLAAC-learned addresses are added as /128s on the
> interface, but I don't see how this is a problem, not to mention
> "broken"? The route to the on-link /64 does get correctly added here, at
> least.
> 
> FWIW: NetworkManager has started processing RAs in userspace, and
> without having confirmed it, I would guess that it simply deals with the
> A=1 and L=1 flags in two separate and independent passes, and that it's
> therefore easier to always do the A=1 part as /128. If it had always
> used /64 instead, you'd automatically get an on-link route, which in
> turn would break the A=1, L=0 case.

The kernel should install the IPv6 address with /64 prefixlen without also
installing a prefix route for that subnet. Currently the kernel does this
automatically.