Linux Bridging Problem

Hi,
  I am trying to creat a bridge with the following command:
        brctl addbr br0
        brctl addif br0 eth0
        brctl addif br0 pci0
        ifconfig eth0 up
        ifconfig pci0 up
        ifconfig br0 up
        dhclient br0

I am able to see the bridge and interfaces to the bridge using brctl show command.. But when I run the
dhclient br0 command, the system stops responding.  I am not able to see anything on the termnial and the termnial does not respond...  Please let me what is the problem....

Thanks,
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