Cisco ASA Series Cli Configuration Manual page 787

Chapter 1 Configuring Network Object NAT
hostname(config-network-object)# host 10.10.10.21
hostname(config-network-object)# object-group network nat-pat-grp
hostname(config-network-object)# network-object object nat-range1
hostname(config-network-object)# network-object object pat-ip1
hostname(config-network-object)# object network my_net_obj5
hostname(config-network-object)# subnet 10.76.11.0 255.255.255.0
hostname(config-network-object)# nat (inside,outside) dynamic nat-pat-grp interface
The following example configures dynamic NAT with dynamic PAT backup to translate IPv6 hosts to
IPv4. Hosts on inside network 2001:DB8::/96 are mapped first to the IPv4_NAT_RANGE pool
(209.165.201.1 to 209.165.201.30). After all addresses in the IPv4_NAT_RANGE pool are allocated,
dynamic PAT is performed using the IPv4_PAT address (209.165.201.31). In the event that the PAT
translations are also used up, dynamic PAT is performed using the outside interface address.
hostname(config)# object network IPv4_NAT_RANGE
hostname(config-network-object)# range 209.165.201.1 209.165.201.30
hostname(config-network-object)# object network IPv4_PAT
hostname(config-network-object)# host 209.165.201.31
hostname(config-network-object)# object-group network IPv4_GROUP
hostname(config-network-object)# network-object object IPv4_NAT_RANGE
hostname(config-network-object)# network-object object IPv4_PAT
hostname(config-network-object)# object network my_net_obj5
hostname(config-network-object)# subnet 2001:DB8::/96
hostname(config-network-object)# nat (inside,outside) dynamic IPv4_GROUP interface
Configuring Dynamic PAT (Hide)
This section describes how to configure network object NAT for dynamic PAT (hide). For more
information, see the
Guidelines
For a PAT pool:
•
•
For extended PAT for a PAT pool:
•
"Dynamic PAT" section on page
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 that can be used. (8.4(3) and later, not including 8.5(1) or 8.6(1)) If you have a lot of traffic
that uses the lower port ranges, 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.
If you use the same PAT pool object in two separate rules, then be sure to specify the same options
for each rule. For example, if one rule specifies extended PAT and a flat range, then the other rule
must also specify extended PAT and a flat range.
Many application inspections do not support extended PAT. See the
page 1-4 in Chapter 1, "Getting Started with Application Layer Protocol Inspection,"
list of unsupported inspections.
Configuring Network Object NAT
1-8.
"Default Settings" section on
Cisco ASA Series CLI Configuration Guide
for a complete
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