Lab Minutes Forum

Technical Discussion => Routing and Switching => Topic started by: ackld on February 22, 2014, 07:28:33 AM

Title: NAT on a stick
Post by: ackld on February 22, 2014, 07:28:33 AM

Hi there,

Can you please explain what NAT on a stick is with an example? I
I really can not find a lot of cut to the chase explanation and I am still not sure how it function.

Thanks a lot
Rick

Title: Re: NAT on a stick
Post by: MC on February 22, 2014, 04:58:22 PM

NAT on a router usually requires two interfaces; inside and outside. In a situation where you have only one interface, you can leverage a loopback interface for your 'ip nat outside'. The trick is to force traffic to be routed out the loopback using global policy-based routing. Once the packet is NATed, the router will once again consult the routing table to route packet to destination.
I know it is a strange concept and personally have not found real-life application for it. the last time I encountered this was in a CCIE lab.
Here is the link to Cisco Doc.

http://www.cisco.com/c/en/us/support/docs/ip/network-address-translation-nat/6505-nat-on-stick.html

Title: Re: NAT on a stick
Post by: ackld on February 22, 2014, 11:19:32 PM

Thank you. I will have a look.