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OpenStack - Juno - Neutron - verify connectivity - External Network

Hello,

I try installed OpenStack Juno following the instructions (http://docs.openstack.org/juno/install-guide/install/apt/content/). Now, I stuck at the end of Chapter 6 "Add a networking component". I'v already done and verify all previous steps.

The last step in Chapter 6 -> "Create initial networks" is to "Verify the Connectivity". I should be able to ping the tenant router gateway from any other node including my Host PC. But I can't even ping the router gateway from the contoller or network node.

I think I messed something up with of that commands:

neutron subnet-create ext-net --name ext-subnet \ --allocation-pool start=FLOATING_IP_START,end=FLOATING_IP_END \ --disable-dhcp --gateway EXTERNAL_NETWORK_GATEWAY EXTERNAL_NETWORK_CIDR

neutron subnet-create demo-net --name demo-subnet \ --gateway TENANT_NETWORK_GATEWAY TENANT_NETWORK_CIDR

or I configured something wrong in my VBox. Let's face first the VBox configuration. After that I provide some further Informations and we can have a look at the above commands.

So one Question that drives my Mind is... Can I randomly pick the IP Adress that I have to provide for the "External Network" HOST-ONLY Adapter in the VBOX Global Settings or must this correspond something from my HOST PC Network Interface ?