Source IP Address Translation Overview

During source IP address translation, the original source IP address, port number, or both are translated to a different number.

Before You Begin
For background information, read: Understanding NAT Example: Configuring Security Policies—Detailed Configuration

Before You Begin

For background information, read:

JUNOS software performs NAT in the following ways:

Reverse mapping in static NAT—There is no explicit NAT action in a policy to trigger this type of NAT-src. As long as the traffic matches a “ permit” policy and reverse mapping in static NAT is found on the egress interface, the source IP address will get translated according to reverse mapping.
Source pool defined on egress interface—When performing source network translation (NAT-src), source pool provides JUNOS software with a supply of addresses from which to draw. When a policy requires NAT-src and references a specific source pool, JUNOS software draws addresses from that pool when translation is performed.