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CCNA® Cisco Certified Network Associate: Study Guide, Seventh Edition by Todd Lammle

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Testing and Troubleshooting NAT

Cisco’s NAT gives you some serious power—and without too much effort, because the configurations are really pretty simple. But we all know nothing’s perfect, so in case something goes wrong, you can figure out some of the more common causes by going through this list of possible snags:

  • Check the dynamic pools. Are they composed of the right scope of addresses?
  • Check to see if any dynamic pools overlap.
  • Check to see if the addresses used for static mapping and those in the dynamic pools overlap.
  • Ensure that your access lists specify the correct addresses for translation.
  • Make sure there aren’t any addresses left out that need to be there, and ensure that none are included that shouldn’t be.
  • Check to make sure you’ve ...

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