Sample data flows for ICMP and UDP

Summary

This example shows the establishment of a new connection.

Workflow

ICMP and UDP Data Flow
  1. The first UDP packet originates from the client and is delivered to one device (based on the load balancing method).
  2. The node that received the first packet queries the director node that is chosen based on a hash of the source/destination IP address and ports.
  3. The director finds no existing flow, creates a director flow and forwards the packet back to the previous node. In other words, the director has elected an owner for this flow.
  4. The owner creates the flow, sends a state update to the director, and forwards the packet to the server.
  5. The second UDP packet originates from the server and is delivered to the forwarder.
  6. The forwarder queries the director for ownership information. For short-lived flows such as DNS, instead of querying, the forwarder immediately sends the packet to the director, which then sends it to the owner.
  7. The director replies to the forwarder with ownership information.
  8. The forwarder creates a forwarding flow to record owner information and forwards the packet to the owner.
  9. The owner forwards the packet to the client.