[Bridge] bridge physical to several dummy interface

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Hi:
    i want to bridge my eth0 interface to several dummy interface, like
vmware or xen did,
so i can request several dhcp ip address via several mac addresses.
   but i am stuck in the first step:
   assume my eth0 is 192.168.10.1, and it can ping 192.168.10.254.
    ifconfig br0 up
    brctl setfd br0 0
    brctl addif br0 eth0

    now i can not ping 192.168.10.254 anymore.
    but if i set 192.168.10.2 to br0, i can ping 192.168.10.254.
    and "dhclient eth0" can get ip addess from dhcp server(that surprise
me!!)
    i try to add dummy interface to br0, but dummy interface can not work,
like eth0.
    "brctl showmac br0" give me may mac addresses, so i think bridging is
working.

    i think i must misunderstanding the brindge concept.
    can i keep eth0 work after it join br0?
    thanks a lot for your help!!

Regards,
tbsky
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