linux-kernel - Re: [PATCH net-next v2 6/6] vxlan: allow multiple VXLANs with same VNI for IPv6 link-local addresses

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Date:   Fri, 14 Apr 2017 10:38:30 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Matthias Schiffer <mschiffer@...verse-factory.net>
Cc:     davem@...emloft.net, jbenc@...hat.com, hannes@...essinduktion.org,
        pshelar@....org, aduyck@...antis.com, roopa@...ulusnetworks.com,
        netdev@...r.kernel.org, dev@...nvswitch.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v2 6/6] vxlan: allow multiple VXLANs with same
 VNI for IPv6 link-local addresses

On Fri, 14 Apr 2017 18:44:46 +0200
Matthias Schiffer <mschiffer@...verse-factory.net> wrote:

> As link-local addresses are only valid for a single interface, we can allow
> to use the same VNI for multiple independent VXLANs, as long as the used
> interfaces are distinct. This way, VXLANs can always be used as a drop-in
> replacement for VLANs with greater ID space.
> 
> This also extends VNI lookup to respect the ifindex when link-local IPv6
> addresses are used, so using the same VNI on multiple interfaces can
> actually work.
> 
> Signed-off-by: Matthias Schiffer <mschiffer@...verse-factory.net>

Why does this have to be IPv6 specific?

What about the case where VXLAN is not bound to an interface?
If that is used then that could be a problem.