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Cisco ASA 5500 Series Configuration Guide using ASDM
Chapter 34 Configuring Twice NAT (ASA 8.3 and Later)
Feature History for Twice NAT
Round robin PAT pool allocation uses the same
IP address for existing hosts
8.4(3) When using a PAT pool with round robin allocation, if a host
has an existing connection, then subsequent connections
from that host will use the same PAT IP address if ports are
available.
We did not modify any screens.
This feature is not available in 8.5(1) or 8.6(1).
Flat range of PAT ports for a PAT pool 8.4(3) If available, the real source port number is used for the
mapped port. However, if the real port is not available, by
default the mapped ports are chosen from the same range of
ports as the real port number: 0 to 511, 512 to 1023, and
1024 to 65535. Therefore, ports below 1024 have only a
small PAT pool.
If you have a lot of traffic that uses the lower port ranges,
when using a PAT pool, you can now specify a flat range of
ports to be used instead of the three unequal-sized tiers:
either 1024 to 65535, or 1 to 65535.
We modified the following screens: Configuration >
Firewall > NAT Rules > Add/Edit NAT Rule.
This feature is not available in 8.5(1) or 8.6(1).
Table 34-1 Feature History for Twice NAT (continued)
Feature Name
Platform
Releases Feature Information