13.20 NAT with Route Maps - Why is 'ip nat inside' not required?

Hey guys,

After completing this task i noticed that the solution does not include adding 'ip nat inside' to all non-outside NAT interfaces in R2. However it does specify to use 'ip nat outside'.

For my own understanding, why is 'ip nat inside' not required? What is different than with 'ip nat inside' applied to lo0 and the fa0/0 on R2?

 

Thanks!

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