Weitere Erkenntnis:
root@bjo-wohnung:~# ping6 fd74:fdaa:9dc4:0:fa1a:67ff:feeb:c77e
PING fd74:fdaa:9dc4:0:fa1a:67ff:feeb:c77e
(fd74:fdaa:9dc4:0:fa1a:67ff:feeb:c77e): 56 data bytes
64 bytes from fd74:fdaa:9dc4:0:fa1a:67ff:feeb:c77e: seq=0 ttl=64
time=196.575 ms
64 bytes from fd74:fdaa:9dc4:0:fa1a:67ff:feeb:c77e: seq=1 ttl=64
time=72.192 ms
64 bytes from fd74:fdaa:9dc4:0:fa1a:67ff:feeb:c77e: seq=2 ttl=64
time=98.699 ms
64 bytes from fd74:fdaa:9dc4:0:fa1a:67ff:feeb:c77e: seq=3 ttl=64
time=106.448 ms
64 bytes from fd74:fdaa:9dc4:0:fa1a:67ff:feeb:c77e: seq=5 ttl=64
time=120.734 ms
64 bytes from fd74:fdaa:9dc4:0:fa1a:67ff:feeb:c77e: seq=6 ttl=64
time=106.688 ms
64 bytes from fd74:fdaa:9dc4:0:fa1a:67ff:feeb:c77e: seq=10 ttl=64
time=77.952 ms
^C
--- fd74:fdaa:9dc4:0:fa1a:67ff:feeb:c77e ping statistics ---
12 packets transmitted, 7 packets received, 41% packet loss
round-trip min/avg/max = 72.192/111.326/196.575 ms
Von den Gateways also durchgängig nicht erreichbar, von anderen Routern
im selben VPN schon.