Hi Andy
...
Could it be waiting for duplicate address detection (DAD)? You could try
with:
iface eth0 inet6 static
address aaaa:bbbb:10:60:11::4/80
gateway aaaa:bbbb:10:60:11::2
dad-attempts 0
…
That's it. Thank you. Quite easy to understand.
Yet I am even more interested in why that was no problem with previous Debian versions. And indeed as it's a system within a network for me dad will stay enabled - obviously ;-).
regards
hede