NAT Overlapping Networks


Scenario:

Fruity international has bought Juicy Corporate and is merging the companies into a new one called “Fruity Juicy”. You are the network engineer responsible for the network migration. Unfortunately both networks are using the same address space so you’ll have to use NAT temporarily so you can do an IP address migration somewhere in the future.

Goal:

  • All IP addresses have been preconfigured for you.
  • Ensure router Banana and Apple can communicate with each other without changing any IP address.

IOS:

c3640-jk9o3s-mz.124-16.bin

Topology:

NAT Overlapping Networks

Video Solution:

Configuration Files

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Written by René Molenaar - CCIE #41726

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About the Author: Rene Molenaar

René - CCIE #41726 is the creator of GNS3Vault.com where he shares CCNA, CCNP and CCIE R&S labs. He also blogs about networking on http://networklessons.com

9 Comments

  1. Hi Matthew,

    You could use port forwarding but let’s not ;D The goal should be to have full connectivity between the two networks, no matter what ports are being used. In a real life situation there will be clients that should be able to talk with each other.

    Good luck!

    Rene

    1. This is a difficult one and not something I recommend for beginners.

      You’d need do NAT on both sides, but since remote hosts won’t have reachability to others, you’ll need to also do port-forwarding on both sides too.

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