New answers tagged bridge
A "bridge" is a layer 2 phenomenon, which won't help you communicate between two different subnets. What you have is a route (and firewall rules that permit traffic between the two subnets).
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 ...
It looks like you're being bitten by the forwarding delay. check out man brctl for details on how to tweak the various timing paramenters, but essentially what happens is that when brctl puts your bridge together it has to wait a little bit to learn the topology of your new network before it actually sends any packets. Long answer short, this might fix ...
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.
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