[ 3520.162126] bridge: filtering via arp/ip/ip6tables is no longer available by default. Update your scripts to load br_netfilter if you need this.
[ 3520.220979] br0: port 1(dummy0) entered blocking state
[ 3520.220994] br0: port 1(dummy0) entered disabled state
[ 3520.221073] device dummy0 entered promiscuous mode
[ 3520.392502] br0: port 1(dummy0) entered blocking state
[ 3520.392525] br0: port 1(dummy0) entered forwarding state
[ 3520.392607] IPv6: ADDRCONF(NETDEV_CHANGE): br0: link becomes ready