On 16/06/16(Thu) 14:24, mich...@lechtermann.net wrote:
> >Synopsis:    ping6 fe80::29c:2ff:fe9d:6042%gre0 (example) fails with 5.9 and 
> >-current
> >Category:    kernel
> >Environment:
>       System      : OpenBSD 5.9
>       Details     : OpenBSD 5.9-stable (GENERIC.MP) #2: Mon Jun  6 13:29:56 
> UTC 2016
>                        
> r...@leaseweb.0x13a.net:/usr/src/sys/arch/amd64/compile/GENERIC.MP
> 
>       Architecture: OpenBSD.amd64
>       Machine     : amd64
> >Description:
> IPv6 link-local connections do not work on gre(4) interfaces. I tested this 
> with 5.8 (works), 5.9 (doesn't work) and -current (also doesn't work). It 
> doesn't matter if the gre(4) traffic is tunneled through IPsec or not.
> 
> >How-To-Repeat:
> 
> On host 1:
> 
> # sysctl net.inet.gre.allow=1
> # echo "inet6 eui64
> inet 10.0.0.1 255.255.255.252
> dest 10.0.0.2
> tunnel 192.168.0.1 192.168.0.2
> up" > /etc/hostname.gre0
> sh /etc/netstart gre0
> 
> 
> On host 2:
> 
> # sysctl net.inet.gre.allow=1
> # echo "inet6 eui64
> inet 10.0.0.2 255.255.255.252
> dest 10.0.0.1
> tunnel 192.168.0.2 192.168.0.1
> up" > /etc/hostname.gre0
> sh /etc/netstart gre0

Could you please include the output of:

  "# ifconfig" and
  "# route -n show" ?

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