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Re: MSIE automatic proxy config





guy keren wrote:

> _if_ at all one needs NAT for that... or NAT in _any_ classical sense of
> the word (according to your broad definitions, any using of a proxy server
> is actually an introduction of NAT, since not the original machine's
> addres is being shown in the FROM address of the packet being sent out,
> but a different one (that of the proxy).
>
> guy
>

Actually, NAT by the classical definition is any situation in which a "router"
modifies the packets it routes, but does leave the essence there. What you call
"NAT", is actually called "IP Masquarading", and is a particular instance of NAT.

A proxy is not a NAT. This is both because the packets are aimed at it (which is not
really the reason, as this holds true also of a transparent proxy), and because it
then initiates a totally different TCP connection with the real machine. Different
source IP, different TCP SYN numbering, different request. Everything is brand new.

As for the topic I was refering to at the begining, I will look up policy routing on
CISCO, even though it is not applicable to my particular case this time.

                Shachar



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