Configuring NAT basics for the CCNA with Packet Tracer

NAT Basics Overview

NAT basics, also known as network address translation is an important part of the CCENT and CCNA certification exams. When NAT is implemented it allows a router to translate the source IPv4 address in the packet header as it crosses the router, changing the source address in the packet from one address to another. This allows the sending computer’s message to appear as if it is coming from another computer’s address. When you masquerade the origin of a computer’s IPv4 address on a network it is known as a NAT firewall.

NAT basics lab topology using Packet Tracer

Network address translation is a primary reason that IPv4 addressing has survived and is still in use today. The creation of NAT along with private IPv4 address ranges like to, to, and to has allowed for the conservation of publicly routable IPv4 addresses. One of the results of NAT’s ability translate public addresses at the router to private IPv4 addresses is that the advent of IPv6 addressing has essentially been delayed.

Configuring NAT

For the CCENT and the CCNA certifications you need to know how NAT works and how to configure it on a Cisco router. In the following Packet Tracer exercise and accompanying video tutorials, I demonstrate four different ways of configuring NAT.

  • Static NAT translation
  • Port forwarding static NAT translation
  • NAT overload translation
  • Dynamic NAT translation using a NAT Pool


Download the Packet Tracer 6.3 activity here: NAT_practice_activity

NAT Basics Lab – Video Tutorials

Author: Dan

Dan teaches computer networking and security classes at Central Oregon Community College.

11 thoughts on “Configuring NAT basics for the CCNA with Packet Tracer”

  1. Hi Professor
    I’m Farshid, from iran.
    Every day I look at your courses and I can tell you , i learn whole CCNA from your videos.
    I wanted to say thank you via this email.

  2. Hi Prof.

    I am following your videos and I want to let you know that yours are one of the best have even come across on the internet. Thanks a million for such a good work. I got few questions that I would like to ask if you wouldn’t care.

    1. I see you have CCNA1 to CCNA4, which one is Cisco 100-105 ICND1?

    2. Is it possible for you to please make a complete video tutorial for Cisco 100-105 ICND1 one that I can buy?

    Thanks in advance as a wait your favorable and prompt reply.

  3. Hello Dan,

    I want to thank you for your contribution, I’ve come across so many good instructors so far, yet you’re my favorite. awesome teaching method,simple language and clear voice, keep up the good work.

  4. thank you sir . May Almighty Allah reward you and give you guidance. you tutorial is very useful for me.

  5. When I opened the Packet Tracer 6.3 activity and trying to configure the devices it is showing the message Device is Locked.So plz help me to sort out this kind of issues

  6. Hi Dan,

    Thank you for the clarity in dispensing your lessons.
    Beginners like myself could make out a great deal from the videos.
    Thanks again and keep up with the great work.

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