CCNA NAT1: Static One-to-One NAT with ISP

Bundle lab · $29.99

Build a small but realistic edge topology and configure static one-to-one NAT on R1 so the inside host PC-A (192.168.10.10) always translates to 203.0.113.3. Validate bidirectional reachability with an upstream ISP router and a public server one hop further. Verify translation state and counters on R1 and connectivity from both ends.

Learning objectives

• Identify and mark inside vs outside interfaces correctly on an IOS router
• Configure a static one-to-one NAT mapping with ip nat inside source static
• Verify static NAT: permanent translation entry and statistics on R1
• Confirm end-to-end reachability from the inside host to a public server through translation
• Demonstrate bidirectional reachability to the mapped global IP from the public side

Troubleshooting focus

• No translation appears: inside/outside roles may be reversed or missing
• Return traffic fails: mapped global address is not on the R1 outside segment
• Inside host unreachable: missing default route on host or gateway not 192.168.10.1
• Routing broken pre-NAT: confirm R1's default route toward ISP and ISP's connected reachability