It all depends on how you have configured your br-ex on the network controller. 
If br-ex is on the interface that is attached to 172.x network, provide that 
address details as external network. But ensure you allocate the pool that is 
not being used by others in your coporate network.

From: Geo Varghese [mailto:[email protected]]
Sent: Monday, November 24, 2014 12:17 PM
To: [email protected]; [email protected]
Subject: [Openstack] Need help to create external network

Hi Team,

I  need bit help to to create an external network and add it to router as 
gateway.

Like => 
http://docs.openstack.org/icehouse/install-guide/install/apt/content/neutron_initial-external-network.html

I am referring this command to create subnet for external network

neutron subnet-create ext-net --name ext-subnet
--allocation-pool start=203.0.113.101,end=203.0.113.200
--disable-dhcp --gateway 203.0.113.1 203.0.113.0/24<http://203.0.113.0/24>


But my current network is bit complex

1) My machine local machine Ip => 172.17.4.64 (Its in our internal network of 
our company with gateway 172.17.4.254)

2) I installed kvm on my local machine and controller node with IP => 
192.168.122.54 with gateway 192.168.122.1

3) Openstack instance network is in 192.168.1.101 to 192.168.1.125 with gateway 
192.168.1.1

Anyone please tell me, which IP addresses I have to give while creating above 
subnet for my external network.
--
Regards,
Geo Varghese
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