On Thu, May 10, 2018 at 11:18:23PM +0530, nusid...@redhat.com wrote:
> From: Numan Siddique <nusid...@redhat.com>
>
> Presently when a VM's IPv6 stack sends a Neighbor Solicitation request for its
> router IP, (mostly when the ND cache entry for the router is in STALE state)
> ovn-controller responds with a Neighbor Adv packet (using the action nd_na).
> But it doesn't set 'ND_RSO_ROUTER' in the RSO flags (please see RFC4861 page
> 23).
> Because of which, the VM deletes the default route. The default route gets
> added
> again when the next RA is received (but would again gets deleted if its sends
> NS request). And this results in disruption of IPv6 traffic.
>
> This patch addresses this issue by adding a new action 'nd_na_router' which is
> same as 'nd_na' but it sets the 'ND_RSO_ROUTER' in the RSO flags. ovn-northd
> uses this action. A new action is added instead of modifying the existing
> 'nd_na'
> action. This is because
> - We cannot set the RSO flags in the "nd_na { ..actions .. }"
> - It would be ugly to have something like nd_na { router_flags, ...actions
> .. }
>
> Reported-at: https://bugzilla.redhat.com/show_bug.cgi?id=1567735
> Signed-off-by: Numan Siddique <nusid...@redhat.com>
> Acked-by: Mark Michelson <mmich...@redhat.com>
Please document the new action in ovn/ovn-sb.xml.
Otherwise this looks good to me, thank you!
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