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NAT Confusion

Hi, I was wondering if any of you out there are also confused as to when to use the 'ip nat inside' & 'ip nat outside' cmds. I've done extensive reading on this & even the Cisco web site tends to be confusing on this issue.

Is it as simple as the network that will be natted coming in from the outside has the 'ip nat outside' cmd & the interface that has the internal networks have the 'ip nat inside' cmd?

Thanks

Lincoln

3 REPLIES
New Member

Re: NAT Confusion

New Member

Re: NAT Confusion

Hi Lincoln,

yes I understand your confusion as reading the cisco piece needs a degree in microbiology ( or something similar).

I got used to this by trial and error. The following command:

ip nat inside source static 10.0.15.9 194.169.118.198

means if from outside you hit the 118.198 address then you will go to the inside 10,x.x.x address

ip nat outside source static 194.169.118.198 10.0.15.9 does the same but opposite - Anything hitting 10.0.15.9 goes to 118.198

Hope this makes more sense !

R

New Member

Re: NAT Confusion

Lincoln,

Yes, very straight forward. NAT inside typically refers to the private side, whereas NAT outside refers to the public side. Now, there are certain scenarios where that is not true, but it's a general sense.

JS

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