Michelle Konzack writes:

Ah thanks...

--[ command 'ssh -l root mail.tamay-dogan.net "route -A inet6 -n"' ]----
Kernel-IPv6-Routentabelle
Destination                    Next Hop                   Flag Met Ref Use If
2a01:4f8:d12:1300::1/128 :: U 1024 0 0 eth0 2a01:4f8:d12:1300::/64 :: U 256 0 1 eth0 fe80::/64 :: U 256 0 0 eth0 ::/0 2a01:4f8:d12:1300::1 UG 1 0 2196 eth0
::/0                           ::                         !n   -1  1  3654 lo
::1/128                        ::                         Un   0   1  5387 lo
2a01:4f8:d12:1300::2/128       ::                         Un   0   1  8864 lo
fe80::21c:14ff:fe01:756/128    ::                         Un   0   1  5247 lo
ff00::/8 :: U 256 0 0 eth0
::/0                           ::                         !n   -1  1  3654 lo
------------------------------------------------------------------------

Looks weird to me...

Can it be, that the lines with "fe80" create trouble?  It  seems  it  is
from IPv6 autoconf, speak, the from the MAC address generated IPv6 addr.

No, fe80 autoconf shouldn't interfere. But those !n routes to ::/0 look like trouble. It's a reject entry. Looks like both of them will block all your packets to ::/0.

That's not exactly going to help your Internet connectivity…

I suspect that you can ping your router 2a01:4f8:d12:1300::1, since that most specific route entry will take priority, but everything else going to the default ::/0 is going to be dropped on the floor.

You need to chase down where that broken route entry comes from.

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