Add missing patch.
--- debian/ifupdown.sh.old 2019-01-16 10:27:42.000000000 +0100
+++ debian/ifupdown.sh 2020-02-07 13:10:50.822365528 +0100
@@ -31,6 +31,12 @@
if [ "$IF_BRIDGE_HW" ]; then
ip link set dev $IFACE address $IF_BRIDGE_HW
fi
+# Activate VLAN filtering on VLAN aware bridges
+ if [ "$IF_BRIDGE_VLAN_AWARE" = "yes" ]; then
+ ip link set dev $IFACE type bridge vlan_filtering 1
+ else
+ ip link set dev $IFACE type bridge vlan_filtering 0
+ fi
# Wait for the ports to become available
if [ "$IF_BRIDGE_WAITPORT" ]
then
