Hello.
Looks like I wrongly reported the failing version, sorry.
It's 6.12.69+deb13-amd64 that fails
As I rolled back, reportbug was picking the wrong version, and I
manually set another wrong one.
Anyway, my network configuration is fairly straightforward, not even a
key involved
auto gre3
iface gre3 inet6 static
address 2a0c:b640:fffe::21:2834:2
netmask 122
remote 2a0c:b640:fffe::21:2834:1
pre-up ip link add gre3 type ip6gre local 2001:41d0:302:2000::2144 remote
2a0c:b641:6::
post-up ip ro add 2a0c:b641:6::/128 via
2001:41d0:0302:2000:0000:0000:0000:0001 dev eth0
post-down ip ro del 2a0c:b641:6::/128 via
2001:41d0:0302:2000:0000:0000:0000:0001 dev eth0
post-down ip link del gre3
Regards,
--
Bastien