Re: ipv6:remove ipv6 global address after the interface is down

[zhuyj]

On 04/01/2014 05:35 PM, Hannes Frederic Sowa wrote:
> On Tue, Apr 01, 2014 at 05:30:31PM +0800, zhuyj wrote:
> > Hi, Paul
> >
> > With kernel 2.6.34.x, the following problem will appear.
> >
> >   TargetA ------------------------- TargetB
> > 3000::1/64 3000::2/64
> >
> >   TargetA
> >     - bring the interface down by doing an "ifconfig eth1 down"
> >     - bring the interface back up by doing an "ifconfig eth1 up"
> >
> > TargetB
> >     - ping6 3000::1
> >        ping6 succeeds the first time
> >     - after bringing the interface on TargetA down and then back up,
> > ping6 to the interface fails.
> >
> > With the latest mainline kernel(3.4+), this problem is resolved. When
> > eth1 is down, ipv6 address and route item are removed.
> > But with kernel 2.6.34.x, when eth1 is down, ipv6 address remains while
> > route item is removed.
> >
> > So when eth1 is up and assign the previous ipv6 address, with 2.6.34.x,
> > some errors will appear. But with latest mainline kernel, it can work well.
> >
> > So I made a patch to fix this problem in kernel 2.6.34.x. Please merge
> > this to kernel2.6.34.x.
> 2.6.34 stable is EOL and won't get updated anymore. If this is problem is also
> present in other, still maintained, stable kernel this would be possible.
Hi, Hannes

It is fortunate. I checked other stable kernel. They can work well. 
Maybe this patch can only fix the problem on 2.6.34.x.

> Can you identify the upstream commit which repaired this problem and when it
> got introduced?
commit 73a8bd74 [ipv6:Revert 'administrative down' address handling 
changes] can fix this problem.

Best Regards!
Zhu Yanjun
> Thanks,
>
>    Hannes

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