Re: excluding an ip from count

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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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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

Thread

excluding an ip from count richard <noreply@example.com> - 2013-10-15 19:38 -0400
  Re: excluding an ip from count "Beauregard T. Shagnasty" <a.nony.mous@example.invalid> - 2013-10-16 00:17 +0000
  Re: excluding an ip from count Tobiah <toby@tobiah.org> - 2013-10-16 09:44 -0700
    Re: excluding an ip from count richard <noreply@example.com> - 2013-10-16 15:38 -0400
      Re: excluding an ip from count Scott Johnson <noonehome@chalupasworld.com> - 2013-10-16 15:40 -0700
        Re: excluding an ip from count Tobiah <toby@tobiah.org> - 2013-10-18 11:29 -0700
          Re: excluding an ip from count Scott Johnson <noonehome@chalupasworld.com> - 2013-10-18 16:14 -0700
            Re: excluding an ip from count Evan Platt <evan@theobvious.espphotography.com.invalid> - 2013-10-19 08:06 -0700
              Re: excluding an ip from count Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2013-10-19 11:34 -0400
                Re: excluding an ip from count Denis McMahon <denismfmcmahon@gmail.com> - 2013-10-19 23:23 +0000
                Re: excluding an ip from count richard <noreply@example.com> - 2013-10-19 19:52 -0400
                Re: excluding an ip from count Jerry Stuckle <jstucklex@attglobal.net> - 2013-10-19 22:31 -0400
                Re: excluding an ip from count Evan Platt <evan@theobvious.espphotography.com.invalid> - 2013-10-19 22:24 -0700
                Re: excluding an ip from count Jerry Stuckle <jstucklex@attglobal.net> - 2013-10-20 09:13 -0400
                Re: excluding an ip from count Evan Platt <evan@theobvious.espphotography.com.invalid> - 2013-10-20 06:52 -0700
                Re: excluding an ip from count Jerry Stuckle <jstucklex@attglobal.net> - 2013-10-20 10:32 -0400
                Re: excluding an ip from count Evan Platt <evan@theobvious.espphotography.com.invalid> - 2013-10-20 09:41 -0700
                Re: excluding an ip from count Denis McMahon <denismfmcmahon@gmail.com> - 2013-10-20 18:23 +0000
                Re: excluding an ip from count Jerry Stuckle <jstucklex@attglobal.net> - 2013-10-20 21:04 -0400
                Re: excluding an ip from count Evan Platt <evan@theobvious.espphotography.com.invalid> - 2013-10-20 22:56 -0700
                Re: excluding an ip from count Jerry Stuckle <jstucklex@attglobal.net> - 2013-10-21 03:32 -0400
                Re: excluding an ip from count Arno Welzel <usenet@arnowelzel.de> - 2013-10-21 11:54 +0200
                Re: excluding an ip from count Tim Streater <timstreater@greenbee.net> - 2013-10-21 11:06 +0100
                Re: excluding an ip from count Jerry Stuckle <jstucklex@attglobal.net> - 2013-10-21 08:05 -0400
                Re: excluding an ip from count Denis McMahon <denismfmcmahon@gmail.com> - 2013-10-20 18:14 +0000
                Re: excluding an ip from count Tim Streater <timstreater@greenbee.net> - 2013-10-20 22:24 +0100
                Re: excluding an ip from count Denis McMahon <denismfmcmahon@gmail.com> - 2013-10-21 18:30 +0000
                Re: excluding an ip from count Denis McMahon <denismfmcmahon@gmail.com> - 2013-10-21 18:34 +0000
                Re: excluding an ip from count Evan Platt <evan@theobvious.espphotography.com.invalid> - 2013-10-19 23:02 -0700
                Re: excluding an ip from count Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2013-10-20 10:12 -0400
                Re: excluding an ip from count Evan Platt <evan@theobvious.espphotography.com.invalid> - 2013-10-20 09:43 -0700
                Re: excluding an ip from count Jerry Stuckle <jstucklex@attglobal.net> - 2013-10-20 21:05 -0400
                Re: excluding an ip from count Denis McMahon <denismfmcmahon@gmail.com> - 2013-10-20 18:07 +0000
                Re: excluding an ip from count Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2013-10-20 10:08 -0400
              Re: excluding an ip from count The Natural Philosopher <tnp@invalid.invalid> - 2013-10-19 18:44 +0100
              Re: excluding an ip from count Richard Yates <richard@yatesguitar.com> - 2013-10-19 14:50 -0700
                Re: excluding an ip from count The Natural Philosopher <tnp@invalid.invalid> - 2013-10-19 23:37 +0100
            Re: excluding an ip from count Richard Yates <richard@yatesguitar.com> - 2013-10-19 14:52 -0700
              Re: excluding an ip from count Scott Johnson <noonehome@chalupasworld.com> - 2013-10-20 11:37 -0700
  Re: excluding an ip from count Arno Welzel <usenet@arnowelzel.de> - 2013-10-20 16:56 +0200

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