Red Hat Security Advisory 2016-1473-01 – OpenStack Networking is a pluggable, scalable, and API-driven system that provisions networking services to virtual machines. Its main function is to manage connectivity to and from virtual machines. Security Fix: Neutron functionality includes internal firewall management between networks. Due to the relaxed nature of particular rules, it is possible for machines on the same layer 2 networks to forge non-IP traffic, such as ARP and DHCP requests.