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RS0012 - Basic NAT

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The video demonstrates various Network Address Translation (NAT) functionalities on Cisco router. We look at  scenarios when the NAT IP is assigned from the router interface subnet, where proxy-arp is utilized, and the IP is assigned from a completely different subnet.

Topic includes

  • Static NAT
  • Dynamic NAT
  • Port Address Translation (PAT)
  • Conditional NAT
  • Proxy-ARP
  • Static NAT is commonly used to expose services (eg. on servers) to outside (ACL is recommended to restrict access)
  • Dynamic NAT is commonly used for end-users to access outside resources when PAT may break particular applications
  • PAT is commonly used when only unidirectional access is needed and to hide inside hosts as well as to minimize IP usage
  • Conditional NAT is commonly used when a host need to translated to different IPs under different connection (eg. interface being used, destination IP subnet etc.)

About Author

Metha Cheiwanichakorn, CCIE#23585 (RS, Sec, SP), is a Cisco networking enthusiast with years of experience in the industry. He is currently working as a consulting engineer for a Cisco partner. As a founder of and an instructor at, Metha enjoys learning and challenges himself with new Cisco technologies.


I dont have any routers? How can I test these? are there any simulation software that you recommend?

The most popular one is Dynamips/GNS3. It is considered emulator (instead of simulator) since it uses the actual Cisco IOS to run, although nothing is better than actual hardware.

I want you to tell me how you created two loopbacks on SW1 with same subnet.

The loopbacks have subnet of /32 (ie. as shown on diagram and not /24 so they are not really on the same subnet and can have pretty much any IP you want

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