Sorry for replying so late...

On Wed, Jan 29, 2014 at 11:38:47AM +0100, Nicolas Dichtel wrote:

Le 29/01/2014 07:41, Sohny Thomas a écrit :

quoted

Resending this on netdev mailing list:
Default route for link local address is configured automatically if
NETWORKING_IPV6=yes is in ifcfg-eth*.
When the route table for the interface is flushed and a new address is 
added to
the same device with out removing linklocal addr, default route for link 
local
address has to added by default.

I have found the issue to be caused by this checkin

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/net/ipv6?id=62b54dd91567686a1cb118f76a72d5f4764a86dd


According to this change :
He removes adding a link local route if any other address is added , 
applicable
across all interfaces though there's mentioned only lo interface
So below patch fixes for other devices

Signed-off-by: Sohny THomas <redacted>

Your email client has corrupted the patch, it cannot be applied.
Please read Documentation/email-clients.txt

About the patch, I still think that the flush is too agressive. Link local
routes are marked as 'proto kernel', removing them without the link local
address is wrong.

Actually I am not so sure, there is no defined semantic of flush. I would
be ok with all three solutions: leave it as is, always add link-local
address (it does not matter if we don't have a link-local address on
that interface, as a global scoped one is just fine enough) or make flush not
remove the link-local address (but this seems a bit too special cased for me).

Greetings,

  Hannes