[ 3520.230858] bridge: filtering via arp/ip/ip6tables is no longer available by default. Update your scripts to load br_netfilter if you need this.
[ 3520.341371] br0: port 1(dummy0) entered blocking state
[ 3520.342587] br0: port 1(dummy0) entered disabled state
[ 3520.344044] device dummy0 entered promiscuous mode
[ 3520.547777] br0: port 1(dummy0) entered blocking state
[ 3520.548971] br0: port 1(dummy0) entered forwarding state
[ 3520.550403] IPv6: ADDRCONF(NETDEV_CHANGE): br0: link becomes ready