[  300.309192] bridge: filtering via arp/ip/ip6tables is no longer available by default. Update your scripts to load br_netfilter if you need this.
[  300.359729] br0: port 1(dummy0) entered blocking state
[  300.360324] br0: port 1(dummy0) entered disabled state
[  300.361043] device dummy0 entered promiscuous mode
[  300.471540] br0: port 1(dummy0) entered blocking state
[  300.472130] br0: port 1(dummy0) entered forwarding state
[  300.472720] IPv6: ADDRCONF(NETDEV_CHANGE): br0: link becomes ready