VMware, Inc.
Seamless hand-off of data traffic in public cloud environments with reverse path filtering

Abstract:

The disclosure provides an approach for seamless hand-off of data traffic in public cloud environments with reverse path filtering. Techniques are provided for activating an edge services gateway (ESG) virtual computing instance (VCI) on a new host in a data center. Before an underlay converges on the new host, inbound and outbound packets for the ESG VCI are sent by the underlay to the old host and the old tunnels the packets to the new host via a pre-created overlay tunnel. For outbound packets, the new host tunnels the packets back to the old host after the ESG VCI performs network address translation of the source address. Once the new host detects that the underlay converges, the new host stops redirecting the outbound packets to the old host.