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Date:	Wed, 29 Oct 2014 18:36:51 +0900
From:	Erik Kline <>
To:	Hannes Frederic Sowa <>
Cc:	"" <>,
	David Miller <>,
	Ben Hutchings <>,
	Lorenzo Colitti <>
Subject: Re: [PATCH v2 net-next] net: ipv6: Add a sysctl to make optimistic
 addresses useful candidates

(resending; sorry for the dup; my text mail setting was defeated)-:

On Wed, Oct 29, 2014 at 6:34 PM, Erik Kline <> wrote:
> Hannes,
> Given that we spoke about this reduction in the number of netlink messages
> earlier, do you still think it's an issue?
> The end result here is that for listeners on netlink sockets on systems that
> (a) have optimistic dad built-in, (b) have optimistic dad enabled, and (c)
> have use_optimistic set: they'll 2 notifications (with different flags) for
> automatically added addresses on these interfaces.
> (Personally, given that we appear to send an RTM_NEWADDR when the address
> gets deprecated (I think), I think sending one on every flag change of
> interest is in keeping with existing behaviour.)
> On Wed Oct 29 2014 at 12:15:59 AM Lorenzo Colitti <>
> wrote:
>> On Tue, Oct 28, 2014 at 6:11 PM, Erik Kline <> wrote:
>> > Add a sysctl that causes an interface's optimistic addresses
>> > to be considered equivalent to other non-deprecated addresses
>> > for source address selection purposes.  Preferred addresses
>> > will still take precedence over optimistic addresses, subject
>> > to other ranking in the source address selection algorithm.
>> > ...
>> > Signed-off-by: Erik Kline <>
>> Acked-by: Lorenzo Colitti <>
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