netdev - Re: IPv6: autoconfiguration and suspend/resume or link down/up

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Message-ID: <20110721124457.72cb45e4@nehalam.ftrdhcpuser.net>
Date:	Thu, 21 Jul 2011 12:44:57 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Dan Williams <dcbw@...hat.com>
Cc:	Jiri Bohac <jbohac@...e.cz>, netdev@...r.kernel.org,
	Herbert Xu <herbert@...dor.hengli.com.au>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: IPv6: autoconfiguration and suspend/resume or link down/up

On Thu, 21 Jul 2011 11:35:37 -0500
Dan Williams <dcbw@...hat.com> wrote:

> > For problem #2, shouldn't a new RS be sent whenever the interface
> > changes it's IFF_LOWER_UP bit?  IFF_LOWER_UP indicates a carrier on/off
> > event and thus indicates possible disconnect/reconnect to a new network.
> > I don't specifically know how it works now, but if RS isn't triggered
> > from IFF_LOWER_UP, I'd imagine that either (a) something didn't get
> > updated when IFF_LOWER_UP became how carrier was indicated in 2.6.17
> > (commit b00055aacdb172c05067612278ba27265fcd05ce) or (b) there's a
> > reason IFF_LOWER_UP isn'

IFF_RUNING is used to indicate carrier, IFF_LOWER_UP is for layered
devices like vlan's but is rarely used.
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