Re: ipv6: default route for link local address is not added whileassigning a address

From: sohny thomas
Date: Fri Jan 17 2014 - 03:34:39 EST

Hi All,

Any updates on my reply, Any more info is required.
Can this be pulled into the kernel tree?

Thanks & Regards,

On Monday 13 January 2014 02:19 PM, sohny thomas wrote:
On Friday 10 January 2014 10:46 PM, Hannes Frederic Sowa wrote:
On Fri, Jan 10, 2014 at 05:33:08PM +0100, Nicolas Dichtel wrote:
CC: netdev

Le 10/01/2014 13:20, sohny thomas a Ãcrit :
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
address has to added by default.
I would say that removing the link local route but not the link local
is a configuration problem.
If you remove a connected route but not the associated address, you will
the same problem.
We have some user accessible routes that are essential for IPv6 stack
to work at all. So I don't know if I can agree with that.

Maybe flush is a bit too aggressive?

Hi ,

Thank you for the inputs.

In the test for ipv6 default address selection , we are testing the rule
2 as specified in RFC 6724

If Scope(SA) < Scope(SB): If Scope(SA) < Scope(D), then prefer SB
and otherwise prefer SA.
Similarly, if Scope(SB) < Scope(SA): If Scope(SB) < Scope(D), then
prefer SA and otherwise prefer SB.


Check 04:
Destination: ff08::2(OS)
Candidate Source Addresses: fec0::1(SS) or LLA(LS)
Result: fec0::1(SS)

Scope(LLA) < Scope(fec0::1): If Scope(LLA) < Scope(ff08::2), yes,
prefer fec0::1

Now in the test its flushing all the routes and adding an address ,
which in causes to add route into the routing table including the link
local routes.
Earlier in 2.6.32 it used to work fine now due to the above mentioned
check-in this is not happening

Of course we can still just delete a route and add , but even if we
delete the link local route, IMHO i think it should update the LLA route
when the interface is next added an address or bought up which ever is
the case.


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