Understanding NAT Static Source Pools

You can define a one-to-one mapping from an original source IP address to a translated source IP address for a range of IP addresses using the static source pool. Such a mapping ensures that the J-series Services Router always translates a particular source IP address from within that range to the same translated address within a source pool.

It is possible to use a static source pool enabled in a policy that applies to source addresses beyond the range specified in the pool. In such scenarios, the router allows traffic from all source addresses permitted in the policy, applying source IP address translation (NAT-src) to those addresses that fall within the static source pool range but leaving those addresses unchanged that fall outside the static source pool range. If you want the router to apply NAT-src to all source addresses, make sure that the range of source addresses is smaller than the range specified for the static source pool.