[ovs-discuss] GRE with link-local remote_ip: "not a valid IPv6 address"

Gregory Rose gvrose8192 at gmail.com
Tue Sep 3 19:45:45 UTC 2019

On 9/2/2019 7:20 AM, Sven Gebauer wrote:
> Am 27.08.19 um 19:17 schrieb Gregory Rose:
>> Maybe someone else can help with that part but I'm curious why you feel
>> the need to specify the link-local address.
>> - Greg
> Essentially, I'm trying to do GRE-over-Wireguard and need some kind of
> addressing within the Wireguard tunnel. These addresses should not
> collide with anything else in the tunnel endpoint's (unpredictable)
> network environment. So IPv6 link-local addresses are the perfect
> candidate here because the scope makes address collisions (across
> interfaces of the same machine) impossible.
> Anyway, this isn't supported right now according to Ben Pfaff's
> response. So I will either have to use ULA addresses (more complex
> because every tunnel endpoint needs to be configured with the same
> random ULA prefix) or create the GRE tunnels using `ip` and then add
> them to my OVS bridge as system interfaces (probably more CPU-overhead
> compared to OVS-managed GRE tunnels?).
I don't know of any reason why a tunnel created with 'ip' would have 
more CPU overhead
than an OVS managed tunnel.  I've certainly never heard that to be the case.

- Greg

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