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From: Arno Welzel <usenet@arnowelzel.de>
Newsgroups: comp.lang.php
Subject: Re: excluding an ip from count
Date: Mon, 21 Oct 2013 11:54:42 +0200
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Xref: csiph.com comp.lang.php:11520

Am 21.10.2013 09:32, schrieb Jerry Stuckle:

> On 10/21/2013 1:56 AM, Evan Platt wrote:
[...]
>> Yes, exactly.The public IP is assigned to a DEVICE. Only one device
>> truly has that public IP, the rest have a private IP.
>>
> 
> Then please explain how many users can have the "public ip" 192.168.x.x. 
>   I have them on my LAN at home; customers have the *exact same* ip on 
> their LANs.  In fact, I would be there are hundreds of thousands (or 
> millions) of computers out there connected to the internet which have 
> the ip address 192.168.0.x or 192.168.1.x, as indicated by ifconfig (or 
> the Linux equivalent ipconfig or ip -a).
> 
> How can this work?

By the use of NAT.

And no - NAT does not mean that all these computers with private IP
addresses have a public IP address as well. You can find this out the
hard way when trying to use protocols like IPSec or active FTP or when
you try to build a VPN between two LANs which have the same private
network address (e.g. 192.168.1.0/16).


-- 
Arno Welzel
http://arnowelzel.de
http://de-rec-fahrrad.de