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IPv6 resolving not working


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I owe a fritzbox 5530 which is configured for both IPv6 and IPv4.


My armbian ( debian 11 ) SBC ( neo2 running kernel 5.19.1 ) shows: 

root@armbian:~# ip a |grep inet6
    inet6 ::1/128 scope host
    inet6 2a02:a45f:b977:1:3383:1a4e:38e2:733f/128 scope global dynamic noprefixroute
    inet6 2a02:a45f:b977:1:a05d:7fc7:a5d0:d647/64 scope global dynamic noprefixroute
    inet6 fe80::3383:1a4e:38e2:733f/64 scope link noprefixroute



However I am unable to resolve the IPv6 address while for another debian box it is working fine: 

root@armbian:~# ping debian.fritz.box
PING debian.fritz.box(debian.fritz.box (2a02:a45f:b977:1:21d:ecff:fe0f:e2e0)) 56 data bytes
64 bytes from debian.fritz.box (2a02:a45f:b977:1:21d:ecff:fe0f:e2e0): icmp_seq=1 ttl=255 time=4.12 ms
64 bytes from debian.fritz.box (2a02:a45f:b977:1:21d:ecff:fe0f:e2e0): icmp_seq=2 ttl=255 time=3.34 ms

root@armbian:~# ping armbian.fritz.box
PING armbian.fritz.box ( 56(84) bytes of data.
64 bytes from armbian.fritz.box ( icmp_seq=1 ttl=64 time=0.999 ms
64 bytes from armbian.fritz.box ( icmp_seq=2 ttl=64 time=2.51 ms


Any thoughts please?

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