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: