Hot answers tagged bridge
The IP assignment on the br0 interface is so the host system can talk on that interface. Since you're using the separate network card for the host, you can safely turn off the IP address. How to accomplish that with Ubuntu /etc/network/interfaces, I dunno, but I've done it on Centos.
According to it's design, the Linux bridge acts exactly like a plain NWay Ethernet Switch. It keeps it's own ARP/MAC Address Table, and forwards packets according to this table. So Multicast and ARP, as in a plain network switch, go out to every port regardless what their origin is. In order to prevent this behavior, you should set up a firewall, not using ...
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