Table of Contents Virtual topology overview Virtual topology setup non-DVR traffic flow Enabling DVR DVR East-West traffic flow External connectivity Case 1 - Overload NAT (VM2 with no FIP) Case 2 - Static NAT (VM1 with FIP) DVR Pros and Cons To be honest I was a little hesitant to write this post because the topic of Neutron’s DVR has already been exhaustively covered by many, including Assaf Muller, Eran Gampel and in the official OpenStack networking guide.