There are two concepts, NAT and PAT. Nat is a one-to-one mapping of
internal to external addresses, while PAT is what you are referring to,
where many internal addresses can be mapped onto a single (or a few)
external addresses. It does this by using unique port numbers for each
internal request. When the reply comes back, it does a lookup of the port
it arrives back at, and re-addresses it and forwards it back to the
appropriate internal IP address.
Hope this helps,
Travis Gamble
(Oh, by the way... PAT stands for Port Address Translation, I think)
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
Patrick Duggan
Sent: June 7, 2000 7:01 AM
To: '[EMAIL PROTECTED]'
Subject: Nat addressing
Hi one and all,
I have a newby Nat addressing query, no smirking please. Nat
translates private ip addresses, does this mean it is a simple one to one
translation or can a full private addressing schema be implemented requiring
maybe one allocated ip address on an interface? If so how does it work?
Pat
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