Following the Data Path for a Unicast Session

This section describes the process that the services gateway undertakes in establishing a session for packets belonging to a flow that transits the SRX-series services gateways.

To illustrate session establishment and the packet “walk” including the points at which services are applied to the packets of a flow, this example uses the simple case of a unicast session.

This packet “walk” brings together the packet-based processing and flow-based processing that the JUNOS software performs on the packet. It includes the following sections:

• Session Lookup and Packet Match Criteria
• Understanding Session Creation: First-Packet Processing
• Understanding Fast-Path Processing
• Obtaining Information About Sessions By Using the Configuration show Command
• Obtaining Information About Sessions By Using the Operational show Command
• Using the Operational clear Command to Terminate Sessions

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