NAT with deterministic port block allocation

One can configure NAT algorithm-based allocation of blocks of destination ports. By specifying this method, one ensures that an IP address and port are always mapped to the same IP address in a pool and the same block of ports, thus eliminating the need for the logging of address translations. Other benefits include: 

•  Configuration of source IP address prefix matching in the from clause of a NAT rule provides a high degree of scalability. 
•  All Junos-supported ALGs are supported.