I too have a multi-node OpenStack environment and my instances are able to communicate by Floating IP within the same project.
OS: Ubuntu 12.04 Nova: 2012.1+23-0~precise1 network_manager: FlatDHCP libvirt_type: kvm
I too have a multi-node OpenStack environment and my instances are able to communicate by Floating IP within the same project.
OS: Ubuntu 12.04 23-0~precise1
Nova: 2012.1+
network_manager: FlatDHCP
libvirt_type: kvm