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When you troubleshoot NAT configurations, it is important to understand how the NAT configuration on the ASA is used to build the NAT policy table. The network objects used in the NAT configuration are too broad, which causes traffic to inadvertently match these NAT rules, and miss more specific NAT rules. Additionally, the show nat detail command can be used in order to understand which NAT rules are hit by new connections. Manual NAT policies These are processed in the order in which they appear in the configuration. Auto NAT policies These are processed based on the NAT type (static or dynamic) and the prefix (subnet mask) length in the object. After-auto manual NAT policies These are processed in the order in which they appear in the configuration. In order to troubleshoot problems with NAT configurations, use the packet tracer utility in order to verify that a packet hits the NAT policy.
In the example below, a sample TCP packet that enters the inside interface and is destined to a host on the Internet is given.
Choose the NAT rule and click Packet Trace in order to activate the packet tracer from the Cisco Adaptive Security Device Manager (ASDM). The output of the show nat detail command can be used in order to view the NAT policy table. Translate_hits: The number of new connections that match the NAT rule in the forward direction. Untranslate_hits: The number of new connections that match the NAT rule in the reverse direction.
Again, if you see that your new NAT rule has no translate_hits or untranslate_hits, that means that either the traffic does not arrive at the ASA, or perhaps a different rule that has a higher priority in the NAT table matches the traffic. Use packet tracer in order to confirm that a sample packet matches the proper NAT configuration rule on the ASA. Is there a different NAT rule that takes precedence over the NAT rule you intended the traffic to hit? Most commonly, this problem is caused by inbound connections destined to the local (untranslated) address in a NAT statement.
If a packet matches a NAT rule in the NAT RPF-check phase, which indicates that the reverse flow would hit a NAT translation, but does not match a rule in the NAT phase, which indicates that the forward flow would NOT hit a NAT rule, the packet is dropped. NAT rules can be reordered with the CLI if you remove the rule and reinsert it at a specific line number.


Use packet tracer in order to determine if your traffic matches a rule with object definitions that are too broad.
NAT rules can take precedence over the routing table when they determine which interface a packet will egress the ASA. The NAT divert check (which is what can override the routing table) checks to see if there is any NAT rule that specifies destination address translation for an inbound packet that arrives on an interface.
This problem is most often seen for inbound traffic, which arrives on the outside interface, and is usually due to out-of-order NAT rules that divert traffic to unintended interfaces. Note that if the NAT rule is an identity rule, (which means that the IP addresses are not changed by the rule) then the route-lookup keyword can be used (this keyword is not applicable to the example above since the NAT rule is not an identity rule). The route-lookup option is only available if the NAT rule is an 'identity' NAT rule, which means that the IP addresses are not changed by the rule.
The ASA Proxy ARPs for the global IP address range in a NAT statement on the global interface.
This problem is also seen when the global address subnet is inadvertently created to be much larger than it was intended to be.
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For example, a manual NAT rule is placed at the top of the NAT table, which causes more specific rules placed farther down the NAT table to never be hit.
See the next section for more information about how the NAT configuration is used to build the NAT policy table, and how to troubleshoot and resolve specific NAT problems. Packet tracer allows you to specify a sample packet that enters the ASA, and the ASA indicates what configuration applies to the packet and if it is permitted or not.
Specifically, the translate_hits and untranslate_hits counters can be used in order to determine which NAT entries are used on the ASA. The show nat output shows how these rules are used to build the NAT policy table, as well as the number of translate_hits and untranslate_hits for each rule. If the host sends packets destined to the correct address, check the NAT rules that are hit by the connection. If a very broad NAT rule is listed first in the configuration, it might override another, more specific rule farther down in the NAT table.
In order to insert a new rule at a specific line, enter the line number just after the interfaces are specified. If these rules are placed near the top of the NAT table (at the top of Section 1, for example), they might match more traffic than intended and cause NAT rules farther down the table to never be hit.


If this is the case, you should reduce the scope of those objects, or move the rules farther down the NAT table, or to the after-auto section (Section 3) of the NAT table. If an inbound packet matches a translated IP address in a NAT statement, the NAT rule is used in order to determine the egress interface.
If there is no rule that explicitly specifies how to translate that packet's destination IP address, then the global routing table is consulted to determine the egress interface.
The route-lookup keyword causes the ASA to perform an extra check when it matches a NAT rule. This Proxy ARP functionality can be disabled on a per-NAT rule basis if you add the no-proxy-arp keyword to the NAT statement. Once a NAT rule is matched, that NAT rule is applied to the connection and no more NAT policies are checked against the packet. If you see that your new NAT rule has no translate_hits or untranslate_hits, that means that either the traffic does not arrive at the ASA, or perhaps a different rule that has a higher priority in the NAT table matches the traffic. Verify that the NAT rules are correctly defined, and that the objects referenced in the NAT rules are correct.
Next, look at the output of packet tracer in order to see which NAT rules are hit in the NAT phase and the NAT-RPF phase. It checks that the routing table of the ASA forwards the packet to the same egress interface to which this NAT configuration diverts the packet. After the connection is built through the ASA, subsequent packets that match that current connection do not increment the NAT lines (much like the way access-list hit counts work on the ASA).
If the routing table egress interface does not match the NAT divert interface, the NAT rule is not matched (the rule is skipped) and the packet continues down the NAT table to be processed by a later NAT rule.
To resolve an IP address by reverse lookup (get a computer’s name if you only have its IP address), use this NSLookup tool. Explains how to use reverse nslookup command under UNIX or MS-Windows operating systems to find out an IP address to resolve a hostname or domain name. NSLOOKUP or Reverse DNS (rDNS) is a method of resolving an IP address into a domain name, just as the domain name system (DNS) resolves domain names into associated.



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