NAT Dynamic

Posted by September 7, 2011 in Network Services

Scenario:

Your friends Jack and Joe recently switched to a new Internet provider and instead of getting a single public IP address they have received multiple global IP addresses. To make sure all global IP addresses are used they ask you to configure NAT Dynamic for them. Action time!

Goal:

  • All IPv4 addresses have been preconfigured for you.
  • IP Routing has been disabled and a default gateway is configured on router Jack, Joe and WWW.
  • Configure a pool for NAT Dynamic called “GNS3VAULT”. The range of IP addresses you received from the Internet Provider is 172.16.0.1 – 172.16.0.100.
  • Configure NAT Dynamic so when router Jack or Joe connect to router WWW they are translated to one of the IP addresses in the pool.

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IOS:

c3640-jk9s-mz.124-16.bin

Topology:

NAT Dynamic

Video Solution:

Configuration Files

You need to register to download the GNS3 topology file. (Registration is free!)

Once you are logged in you will find the configuration files right here.

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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

10 Comments

  1. [i]Configure a pool for NAT Dynamic called “GNS3VAULT”. The range of IP addresses you received from the Internet Provider is 172.16.0.1 – 172.16.0.100[/i]

    I’m having trouble understanding the above statement. Is the tutorial asking us to allocate the NAT pool from IP range 172.16.0.1 – 172.16.0.100 ?

    It seems to me that the NAT pool should be in the outside interface’s subnet. I can successfully complete the lab if IPs are allocated the 192.168.34.0/24 subnet.

  2. [quote]Configure a pool for NAT Dynamic called “GNS3VAULT”. The range of IP addresses you received from the Internet Provider is 172.16.0.1 – 172.16.0.100

    I’m having trouble understanding the above statement. Is the tutorial asking us to allocate the NAT pool from IP range 172.16.0.1 – 172.16.0.100 ? [/quote]

    That’s right strasser. You can use NAT to translate to IP addresses on your outside interface but also something completely different. You can translate the inside addresses to a pool with the 172.16.0.1 – 100 range.

    Just a little different to spice things up

    ;D

  3. hey rene,.
    can you upload the solution of this lab??
    i need it
    sorry for my english

    1. I just uploaded it to Youtube, will add it to the article + final configs today.

  4. Nice & simple but great if like me you are refreshing stuff you don’t work with very often.

  6. Hi Rene,

    End points are not pinging for me. All interfaces are up and I can ping everywhere from NAT but edge devices can not ping past next hop.

    Ray

Comments are closed.