If you are running stateful services within your data center on the NSX Edge services gateway appliances, it is important to understand the impact to these services when you move workloads from one data center to another. For example, if you run a NAT service on an edge services gateway to control access to an application service in data center A, and that workload is migrated to data center B, the inbound traffic from the client will go through the same NAT service in data center A, traverse the WAN, and egress through data center B. This will break the NAT service.