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On 17 Jul 97 at 7:54, Neil D. Quiogue wrote about: Re: What is NAT?
> On Wed, 16 Jul 1997, Frank Knobbe wrote:
>
> > If the whole private nework is hidden behind one external IP
> > address, than you have a proxy. If 5 private IP addresses are
> > hidden behind 5 (different) external IP addresses, than you have
> > NAT.
>
> Err, how does that save on ip addresses? Based on your explanation,
> I don't think it goes hand in hand with the original objective of
> NAT -- save on depleting ip addresses. Just a thought...
>
> Maybe what you're trying to put is that for example, you have a
> number of local 'illegal' ip addresses then NAT translates them from
> your pool of 'legal' addresses. So it's not exactly having the same
> number of *different* external (legal) ip addresses as the internal
> ip addresses.
>
> Please correct me if my understanding is wrong....
- From your 'pool' of legal, or registered, addresses, yes. But you
always use one internal/illegal address in conjunction with one
external/legal address. In no case do you have two or more internal
addresses associated with only one external address.
With pooling you can save on registered IP addresses. Assuming you
have a 2000 station network and know that not more than 254 people are
using the Internet at the same time, you can make of this. But again,
you always map one internal address to one external address.
Hope that explains it a little better,
Frank
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