Verifying and Troubleshooting NAT Configurations - Cisco NAT
Cisco NAT enables you to do a lot, and the configurations are straightforward. If it does not work, you can spot a few common causes by asking the following questions:
Do the dynamic pools contain the correct range of addresses?
Is there any overlap between dynamic pools?
Is there any overlap between addresses used for static mapping and the addresses in the dynamic pools?
Do the access lists specify the correct addresses to be translated? Are any addresses left out? Are any addresses included that should not be included?
Are the correct inside and outside interfaces specified?
One of the most common problems with a new NAT configuration is not NAT itself, but routing. Remember that you are changing a source or destination address in a packet; after the translation, does the router know what to do with the new address?
Another problem can be timeouts. If a translated address is cached in some system after the dynamic entry has timed out of the NAT table, packets can be sent to the wrong address, or the destination may seem to have disappeared. Besides the ip nat translation timeout command already discussed, you can change several other default timeouts. Table 4-3 lists all the keywords you can use with the ip nat translation. more information, visit http://www.ciscopress.com/articles/ar...
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