[ 2553.369305] bridge: filtering via arp/ip/ip6tables is no longer available by default. Update your scripts to load br_netfilter if you need this.
[ 2553.398613] br0: port 1(dummy0) entered blocking state
[ 2553.398621] br0: port 1(dummy0) entered disabled state
[ 2553.398717] device dummy0 entered promiscuous mode
[ 2553.448019] br0: port 1(dummy0) entered blocking state
[ 2553.448029] br0: port 1(dummy0) entered forwarding state
[ 2553.448074] IPv6: ADDRCONF(NETDEV_CHANGE): br0: link becomes ready