NAT Troubleshooting Cont

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© 2004 Cisco Systems, Ir

The debug ip nat [detailed] command generates a description of each packet that is being considered for translation. This command also outputs information about certain errors or exceptional conditions, such as the failure to allocate a global address. In addition to the information provided by the basic debug ip nat command, the detailed option reports the protocol and the source and destination port numbers for inbound and outbound translations.

As shown in the figure, the debug output includes these key points:

■ "i:" indicates a packet arriving on the inside interface requiring address translation.

■ "o:" indicates a packet arriving on the outside interface requiring address translation.

■ "tcp" refers to the protocol of the packet.

The value following the IP address represents the port number.

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