Flow-Based and Packet-Based Processing

Carrier-grade NAT (CGNAT) J-Flow logging (MX240, MX480, and MX960 with MX-SPC3 card)—Starting in Junos OS Release 21.2R1, we’ve enhanced NAT logging using J-Flow version 9 and IPFIX format to generate logs. While creating or deleting events in NAT44 or NAT64 sessions, jflow-logs are generated.

[See Understanding NAT Event Logging in Flow Monitoring Format on an MX Series Router or NFX250.]