[Bridge] MAC address in bridge device

[frank <frank@si.ct.upc.edu>]

Hi all,
we have a couple of Red Hat 5 servers with OpenVZ with some virtual 
machines (VEs). This virtual machines have veths (virtual ethernet 
devices), and this devices are attached to a bridge device with main 
node ethernet.

# brctl show
vzbr2        8000.001851cfe1c3    no        veth130.0
                                                                  eth0
The bridge device also has an IP because we need to reach host with an 
IP in this subnet.
We have noticed a problem:

When we boot the main host, the bridge takes the IP we have defined to 
it and the MAC af the eth0 device. That's ok.
But when a veth is joined to the bridge device, this one takes the MAC 
of the veth device, so MAC bridge device changes; of course this cause 
different kind of network problems because all hosts which were 
connected still has the old MAC in its arp table.

We have revised a lot of things, but we don't find any explanation. Does 
anybody  know a possible cause of this behaviour?
Where can we look to get more information? Is the bridge working as 
expected?

Thanks in advance for your help.
Regards.

Frank
UPC - Terrassa (Barcelona)



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