Can you do “ip -6 route show” as well? It looks like either your device has hanged IPs, or the lowpan0 bridge driver just isn’t working.
What do you mean by hanged IP?
ip -6 route show
::1 dev lo proto kernel metric 256 pref medium
fde1:cb6f:732a:8706::1 dev lowpan0 proto kernel metric 256 pref medium
fe80::/64 dev eth0 proto kernel metric 256 pref medium
fe80::/64 dev lowpan0 proto kernel metric 256 pref medium
I also incorrectly linked my post from last year, this is the correct post:
https://forum.riot-os.org/t/6lowpan-and-linux-radvd-issue/3636
Thanks, Matt.