About Session RTOs

The data plane software creates RTOs for UDP and TCP sessions and tracks state changes. It also synchronizes traffic for IPv4 passthrough protocols such as Generic Routing Encapsulation (GRE) and IPsec.

RTOs for synchronizing a session include:

• Session creation RTOs on the first packet
• Session deletion and ageout RTOs
• Change-related RTOs, which include:
  • TCP state changes
  • Timeout synchronization request and response messages
  • RTOs for creating and deleting temporary openings in the firewall (pinholes) and child session pinholes

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