netdev - Tunneling GRE over GUE over IPv6

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Message-ID: <20260120123015.0a5337d8@ciel>
Date: Tue, 20 Jan 2026 12:30:15 +0000
From: Marek Küthe <m.k@...6.de>
To: netdev@...r.kernel.org, linux-newbie@...r.kernel.org
Subject: Tunneling GRE over GUE over IPv6

Hello,

I would like to set up a GRE tunnel using GUE or FOU, but it doesn't
seem to be working:
```
root@...t1:~# 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@...t1:~# 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 Küthe

-- 
Marek Küthe
m.k@...6.de
er/ihm he/him

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