On Wed, 2015-07-08 at 10:29 +0900, Lorenzo Colitti wrote: > On Mon, Jul 6, 2015 at 12:05 PM, Erik Kline <e...@google.com> wrote: > > Per RFC 6724, section 4, "Candidate Source Addresses": > > > > It is RECOMMENDED that the candidate source addresses be the set > > of unicast addresses assigned to the interface that will be used > > to send to the destination (the "outgoing" interface). > > > > Add a sysctl to enable this behaviour. > > > > Signed-off-by: Erik Kline <e...@google.com> > > I think this is useful, because it ensures that devices with a working > IPv6 configuration on interface A, and a partial IPv6 configuration on > interface B do not attempt to send packets on interface B using > interface A's source address. > > Example: there are home routers in the wild that send out an IPv6 > router advertisement that configures a default route but no IPv6 > address. This change makes it so that the host does not attempt to use > an IPv6 address from another network (e.g., a cellular data > connection) on the home network. > > It is also what the RFC recommends. > > Acked-by: Lorenzo Colitti <lore...@google.com>
I wonder a little bit, because addresses which match the outgoing interface should get a higher score in saddr_eval, thus be automatically preferred. Is this check not strong enough? I really wonder if we can improve source address selection and make this behavior a default without introducing a new sysctl. Bye, Hannes -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
