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preserve-range (Source NAT Next Gen Services)



Hierarchy Level

Release Information

Statement introduced in Junos OS Release 19.3R2 on MX Series routers (MX240, MX480 and MX960) running Next Gen Services with the MX-SPC3 services card.


For source NAT with port translation, except for deterministic NAT, assign a port within the same range as the incoming port—either 0 through 1023 or 1024 through 65,535. This feature is not available if you configure port block allocation.

Required Privilege Level

interface—To view this statement in the configuration.

interface-control—To add this statement to the configuration.