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Cisco ASA 5500 Series Configuration Guide using ASDM
OL-20339-01
Chapter 27 Configuring Network Object NAT
Licensing Requirements for Network Object NAT
Licensing Requirements for Network Object NAT
The following table shows the licensing requirements for this feature:
Prerequisites for Network Object NAT
Depending on the configuration, you can configure the mapped address inline if desired or you can create
a network object or network object group for the mapped address. Network object groups are particularly
useful for creating a mapped address pool with discontinous IP address ranges or multiple hosts or
subnets. To create a network object or group, see the “Configuring Network Objects and Groups” section
on page 13-1.
For specific guidelines for objects and groups, see the configuration section for the NAT type you want
to configure. See also the “Guidelines and Limitations” section.
Guidelines and Limitations
This section includes the guidelines and limitations for this feature.
Context Mode Guidelines
Supported in single and multiple context mode.
Firewall Mode Guidelines
• Supported in routed and transparent firewall mode.
• In transparent mode, you must specify the real and mapped interfaces; you cannot use --Any--.
• In transparent mode, you cannot configure interface PAT, because the transparent mode interfaces
do not have IP addresses. You also cannot use the management IP address as a mapped address.
IPv6 Guidelines
Does not support IPv6.
Additional Guidelines
• If you change the NAT configuration, and you do not want to wait for existing translations to time
out before the new NAT information is used, you can clear the translation table using the clear xlate
command. However, clearing the translation table disconnects all current connections that use
translations.
Note If you remove a dynamic NAT or PAT rule, and then add a new rule with mapped addresses
that overlap the addresses in the removed rule, then the new rule will not be used until all
connections associated with the removed rule time out or are cleared using the clear xlate
command. This safeguard ensures that the same address is not assigned to multiple hosts.
Model License Requirement
All models Base License.
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