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Date: Wed, 26 Mar 2008 01:20:39 +0900 (JST) From: YOSHIFUJI Hideaki / 吉藤英明 <yoshfuji@...ux-ipv6.org> To: chunkeey@....de Cc: hostap@...ts.shmoo.com, netdev@...r.kernel.org, yoshfuji@...ux-ipv6.org Subject: Re: IPv6 unique local address flushes on up/down In article <200803251707.52528.chunkeey@....de> (at Tue, 25 Mar 2008 17:07:52 +0100), Chr <chunkeey@....de> says: > On Tuesday 25 March 2008 16:24:28 YOSHIFUJI Hideaki / 吉藤英明 wrote: > > In article <200803251557.21563.chunkeey@....de> (at Tue, 25 Mar 2008 > 15:57:21 +0100), Chr <chunkeey@....de> says: > > > Now my question, which _one_ should we fix the applications or the > > > stack?! I think the network stack, but I don't know if there are RFC > > > about this issue... or is there already some flag/setting which I've > > > missed so far? > > > > Well..., in fact, this is known as an uneasy-to-fix issue. > > The behavior han not been changed for long time, so you definately > > need to have work-around for this issue, anyway. > > > > From specification point of view, we need to re-perform DAD (duplicate > > address detection) after down-up cycle or even link-down and up. > > One possible way is to add "tentative" flag for static addresses > > (instead of purging them) when the interface is going down and > > reperform DAD for all of such addresses when the interface is coming up. > > If the link is being down, we might want to use "Optimistic" DAD instead. > > > Ah yeah, ok... I guess... alright! ... > > but another question, about this issue form the userspace side. > > Since I'm going to use the stateful DHCPv6 way... I'm wondering how I can set > the tentative flag from userspace? : Tentative flag cannot be set from userspace. So, if we're going this way, we might need new flag for "admin" or "static" or something alike for manual / static addresses (including link-local addresses, probably). --yoshfuji -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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