Make sure that you have finished the Neutron guides. You should be using private IP addresses for this configuration if possible, since you are testing out a setup. You may want to consider sub interfaces if you can only work off of one NIC.

Here is where your neutron client will connect:

url = http://69.43.72.151:9696
auth_strategy = keystone
admin_auth_url = http://69.43.72.151:35357/v2.0

Here is the error when it tries to access the URL:

2015-06-22 08:28:06.894 1865 TRACE nova.network.neutronv2.api NeutronClientException: 404 Not Found

You should make sure that you can get to each of the IP addresses from each of the nodes. I'd recommend changing the address space to internal addresses so that