Tunneling GRE over GUE over IPv6

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Hello,

I would like to set up a GRE tunnel using GUE or FOU, but it doesn't
seem to be working:
```
root@host1:~# ip link add ip6greguetunnel type ip6gre remote fd6c:ffa:eb7a:=
74e2::141 local fd6c:ffa:eb7a:74e2::171 encap gue encap-dport 6661
RTNETLINK answers: Invalid argument
root@host1:~# ip link add ip6greguetunnel type ip6gre remote fd6c:ffa:eb7a:=
74e2::141 local fd6c:ffa:eb7a:74e2::171 encap fou encap-dport 6661
RTNETLINK answers: Invalid argument
```

Does anyone know why? What am I doing wrong? What does "Invalid
argument" mean in this context?

If this isn't the right place to ask, I would appreciate being directed
to the right place :-)

Best regards,
Marek K=C3=BCthe

--=20
Marek K=C3=BCthe
[email protected]
er/ihm he/him

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