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Newly attached network interface not accessible

I am trying associate multiple network interfaces with a single instance (through Horizon). Although the interface appears in the instance, and I can get an IP through DHCP, I can not access this new network interface from anywhere (it's on the same network as the primary interface, which I can access).

My educated guess is that is because there is no security group associated with the interface. In that case my question becomes: can I associate a security group to the network interface using Horizon (the OpenStack installation I'm using has federated login through Google, and I haven't found how I can use neutron with that).