What's client IP and original client IP?

From: tim S <tim724342@xxxxxxxxx>
To: ISA list <isalist@xxxxxxxxxxxxx>
Date: Wed, 25 May 2005 20:14:51 -0700 (PDT)

I was reading the  log column descriptions on MS site.  Can someone explain 
what are client IP and original client IP?
 
I saw this explanation on MS site and bit confused:
 
Original Client IP == The IP address that distinguishes reverse secondary 
connections.
 
So, if there is a server publishing rule like this:
 
External---<EXT-NIC(136.10.10.50:80)>--ISA--<INT-NIC(10.1.1.1)>------<server:10.1.1.50:80>
 
Assuming the initial connection is made from External, what would be the client 
IP and original Client IP for this rule from 10.1.1.50 point of view?
 
Thanks

                
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What's client IP and original client IP?

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