NAT? is there is easy way to remeber!

Inside local address

Inside global address

Outside local address

Outside global address

Local address

Global address

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Comments

fearlessfreap24

these are from my notes:

NAT allows private users to access the internet by sharing one or more public IP address
the most important types of address
inside local: host on the inside network
inside global: usually assigned by an IPS and allows the customer outside access
outside global: host on the outside network

stunnedsoup

Took me a few minutes to find the Cisco Doc I studied...anyway here it is: what I did was know this document very well. I am very visual so I studied the illustrations. My advice - get a pencil and paper and draw it out until you get familiar with it. Then you get to a point where you can draw it in your head and will know where your Inside Local, Inside Global, etc. go.

Best wishes!

james43026

Inside local = IP address of an inside node, before NAT translation, and is the IP address of the node as seen by devices inside your network.

Inside Global = IP address of an inside node, after NAT translation, and is the IP address of the node as seen by devices outside your network

Outside global = IP address of an outside node, before NAT translation, and is the IP address of the node as seen by devices outside your network, usually a public IP address

Outside Local = IP address of an outside node, after NAT translation, and is the IP address of the node as seen by devices inside your network

volfkhat

For me,
I had to throw out all the Insides & Outsides and Locals & Globals.

Instead,
I drew my own picture and used terms that were more intuitive (see attached).

Hope this helps :]

Nat-cheat.jpg

yrwins

wow... that is really good. thanks...

Danielh22185

volfkhat wrote: »

For me,
I had to throw out all the Insides & Outsides and Locals & Globals.

Instead,
I drew my own picture and used terms that were more intuitive (see attached).

Hope this helps :]

Very nice! I like this visual!

GDaines

stunnedsoup wrote: »

Took me a few minutes to find the Cisco Doc I studied...anyway here it is: what I did was know this document very well.

It's 9:00pm and I'm not in the mood for studying right now which probably doesn't help, but 5 minutes of looking at that and I was as confused as ever with the terms, even the term definitions lost me. Perhaps in the morning and in the right frame of mind it might make more sense.

james43026 wrote: »

Inside local = IP address of an inside node, before NAT translation, and is the IP address of the node as seen by devices inside your network.

Inside Global = IP address of an inside node, after NAT translation, and is the IP address of the node as seen by devices outside your network

Outside global = IP address of an outside node, before NAT translation, and is the IP address of the node as seen by devices outside your network, usually a public IP address

Outside Local = IP address of an outside node, after NAT translation, and is the IP address of the node as seen by devices inside your network

This made much more sense.

volfkhat wrote: »

For me,
I had to throw out all the Insides & Outsides and Locals & Globals.

Instead,
I drew my own picture and used terms that were more intuitive (see attached).

Hope this helps :]

As did this. Thanks guys.

volfkhat

Glad you guys like!!
Save the picture, and share it with others.

Another way i like to remind myself:

I, am always on the INSIDE.
YOU , are always on the OUTSIDE.

:]

mgmguy1

omg..Thank you.
This was so perfect. This explains NAT in simple easy to grasp terms.

mikeybinec

Quick imaginary diagram: host connects to R1 which connects to R2.. Let's pretend R2 is google.com

Your host is an RFC 1918 address which is inside local.. You decide to ping google.com. Your inside local is translated to your routable inside global address, whatever you configured it as;; lets say 1.1.1.1.. Your inside global address travels to an outside global address which is google.com. It's a ping and if the ping is successful, it should travel back to your originating host. So as the ping travels back to you it get's translated from an outside global into a outside local (outside local represents google.com)

Regards