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On 16 Jul 97 at 16:19, Neil D. Quiogue wrote about: Re: What is NAT?
> RFC1631. A short description would be:
> NAT (Network Address Translation) lies on the concept of reusable
> addresses as a short-term solution to depleting ip address
> allocations.
>
> In relation, some organizations have non-registered internal ip
> addresses. NAT translates the internal ip address to another ip
> address for communicating across the Internet. It does this through
> a mechanism that maps a registered, global ip address to each local,
> private ip addresses.
>
> I guess this answers why use NAT security-wise -- to hide your
> internal network behind a single ip address.
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.
NAT mangels IP addresses and keeps port numbers the same. Proxy
mangles IP and port addresses.
Regards,
Frank
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