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Hi

I think you should configure the adress on br100 as well, like this :

iface br100 inet static
bridge_stp off
bridge_fd 0


Could you also check without this :

bridge_ports eth0


If you are not sure of the upper lines, what do you get from this ?

#ifdown -a; ifup -a;


Could you also try to create the fixed network with this command ?

nova network-create private --fixed-range-v4=172.25.27.0/24 --bridge-interface=br100


Sources :