Hello,
we can reproduce this bug.
We have configuration like this:
auto vlan992
iface vlan992 inet manual
bridge_ports bond0.992
bridge_stp off
bridge_maxwait 0
bridge_fd 0
bond0 is the management interface (with IPv4 and IPv6 addresses).
bond0.992 is not explicitly configured anywhere.
On Stretch (bridge-utils 1-15.13) the if-pre-up.d script will call the
create_vlan_port() function with port="bond0.992"
and inside the function the "dev" var will become bond0. So the function
turns off IPv6 for the interface.
--
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Αλέξανδρος Κιούσης - al...@noc.grnet.gr
GRNET NOC System Administrator - http://noc.grnet.gr
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