Dynamic IP
—Allows the one-to-one, dynamic translation
of a source IP address only (no port number) to the next available
address in the NAT address pool. The size of the NAT pool should
be equal to the number of internal hosts that require address translations.
By default, if the source address pool is larger than the NAT address
pool and eventually all of the NAT addresses are allocated, new
connections that need address translation are dropped. To override
this default behavior, use
Advanced (Dynamic IP/Port
Fallback)
to enable use of DIPP addresses when necessary.
In either event, as sessions terminate and the addresses in the
pool become available, they can be allocated to translate new connections.