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Cisco ASA 5500 Series Configuration Guide using ASDM
Chapter 34 Configuring Twice NAT (ASA 8.3 and Later)
Monitoring Twice NAT
a. Enable rule —Enables this NAT rule. The rule is enabled by default.
b. Disable Proxy ARP on egress interface—Disables proxy ARP for incoming packets to the mapped
IP addresses. See the “Mapped Addresses and Routing” section on page 32-22 for more information.
c. (Routed mode; interface(s) specified) Lookup route table to locate egress interface—Determines the
egress interface using a route lookup instead of using the interface specified in the NAT command.
See the “Determining the Egress Interface” section on page 32-24 for more information.
d. Direction—To make the rule unidirectional, choose Unidirectional. The default is Both. Making the
rule unidirectional prevents traffic from initiating connections to the real addresses. You might want
to use this setting for testing purposes.
e. Description—Adds a description about the rule up to 200 characters in length.
Note Although the “Translate DNS replies that match this rule” check box is available if you do not
configure a destination address, this option is not applicable to identity NAT because you are
translating the address to itself, so the DNS reply does not need modification. See the “DNS and
NAT” section on page 32-24 for more information.
Step 9 Click OK.
Monitoring Twice NAT
The Monitoring > Properties > Connection Graphs > Xlates pane lets you view the active Network
Address Translations in a graphical format. You can choose up to four types of statistics to show in one
graph window. You can open multiple graph windows at the same time.
Fields
• Available Graphs—Lists the components you can graph.
–
Xlate Utilization—Displays the ASA NAT utilization.
• Graph Window Title—Shows the graph window name to which you want to add a graph type. To
use an existing window title, select one from the drop-down list. To display graphs in a new window,
enter a new window title.
• Add—Click to move the selected entries in the Available Graphs list to the Selected Graphs list.
• Remove—Click to remove the selected entry from the Selected Graphs list.
• Show Graphs—Click to display a new or updated graph window.