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What is the purpose of Outside NAT?

Posted on 2011-10-18
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I think I understand the basics of inside NAT.  The inside local address gets translated to the inside global on the way out and the inside global gets translated back to the inside local on the way back in. This allows traffic to get to an address that cannot be seen by the other end.  Seems simple enough.  

But I don't understand the purpose of outside global and outside local.  Why would I translate an address from a different part of the network? I don't get the practical purpose.  Can someone please explain this in a simple  practical example?

Thanks!
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Question by:MajorBigDeal
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karnapune earned 2000 total points
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by:MajorBigDeal
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@karnapune, when you say "Outside Local – The IP address of the outside machine as viewed locally on the inside network",  do you mean our inside network or the other guy's inside network?   I can only see the outside global address anyway. Why would I care (how would I know) about the other guy's inside global?   That probably seems like a dumb question since you understand it, already but I dont get what the concept is being used for.  
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by:karnapune
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Hi,

 Outside machine is viewd locally on inside network means you see the machines global ip address in your internal network
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by:MajorBigDeal
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Thanks karnapune I appreciate your taking the time to respond to my question.

So I understand what you are saying that I can see the machines outside global on my local network, but if the machine is on the other side of my router, would I not ALWAYS see his outside global address?  I'm never going to know his outside local address am I? So what is it used for? I'm sorry to be so thick-headed but I'm missing the point of the whole "outside" thing.  I don't understand what it is used for.  

I get the point of the inside local and inside global, that allows me to have my private network access the internet with only a single public address but what is the outside local and outside global used for? I know that it must be important because I see configurations that use it.
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