NAT (Network Address Translation) Configuration on Mountain Sky's Router

To configure the Mountain Sky Router for NAT the following commands need to be introduced to achieve the objective, knowing that:

- Router has interface serial 0 IP address: mask:
- Router has interface ethernet 2 IP address: mask (with subinterfaces) (this is the interface for the student's network, from VLAN3)

So a NAT configuration for Mountain Sky's router should use commands:

interface serial 0
     ip address
     ip nat outside
interface ethernet 2
     ip address
     ip nat inside
ip nat inside source list 101 interface serial0 overload
access-list 101 permit ip any

Or using pools:
ip nat pool net-link prefix-length 25
ip nat inside source list 101 pool net-link

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