netdev - Re: [PATCH v2] net: ipv6: Always leave anycast and multicast groups on link down

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Date:	Fri, 22 Jul 2016 11:37:26 -0600
From:	David Ahern <dsa@...ulusnetworks.com>
To:	Mike Manning <mmanning@...cade.com>, netdev@...r.kernel.org
Subject: Re: [PATCH v2] net: ipv6: Always leave anycast and multicast groups
 on link down

On 7/22/16 11:32 AM, Mike Manning wrote:
> Default kernel behavior is to delete IPv6 addresses on link
> down, which entails deletion of the multicast and the
> subnet-router anycast addresses. These deletions do not
> happen with sysctl setting to keep global IPv6 addresses on
> link down, so every link down/up causes an increment of the
> anycast and multicast refcounts. These bogus refcounts may
> stop these addrs from being removed on subsequent calls to
> delete them. The solution is to leave the groups for the
> multicast and subnet anycast on link down for the callflow
> when global IPv6 addresses are kept.
>
> Fixes: f1705ec197e7 ("net: ipv6: Make address flushing on ifdown optional")
> Signed-off-by: Mike Manning <mmanning@...cade.com>


Acked-by: David Ahern <dsa@...ulusnetworks.com>