| Re: excluding an ip from count [message #183384 is a reply to message #183348] |
Mon, 21 October 2013 18:30   |
Denis McMahon
Messages: 634
Registered: September 2010
Karma:
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Senior Member |
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On Sun, 20 Oct 2013 22:24:16 +0100, Tim Streater wrote:
> It's not a reserved range for NAT. It's reserved for any private network
> (as is 10.x.x.x) because it's guaranteed not to be routed on the
> Internet. Any packet addressed to such an address will be dropped.
Point, my bad, yes you don't have to sit behind NAT on a reserved IP
range at all. You don't have to have any external connection.
I still think that Evan knows what he's talking about, but that there's
some terminology confusion.
For example, when I make a request, the server at the other end sees the
ip that my isp asigns to my router, that is my public ip. I consider that
the machine I'm sitting at doesn't have a public ip, it just has a
private ip, and my router nats the private ip onto the public ip.
However, some people might consider that every machine on my network had
the public ip of the router, and in some phrasings that would be a
correct statement (any request they make outside of the lan appears to
come from that public ip), but it's not a true public ip as incoming
requests on that ip are not guaranteed to hit any specific machine, and
in fact won't go anywhere unless I've opened up and mapped a port on the
router for the incoming connections.
So although I consider that in my frame of reference, and the terminology
that I use, that each machine on my lan has just a private ip, and the lan
as a whole has a public ip, I can conceive that in some peoples
phraseology, especially people who might have had a different learning
path in networking generally and tcp/ip specifically to the one I've
followed, might consider that every machine on my lan had the same public
ip, but separate private ips.
What I am confused about, though, is a post where Evan appeared to be
saying that the lan side ip (ie 192.168.x.x.) was a public ip? Perhaps he
just did what I do occasionally, and got his mucking fords wuddled?
--
Denis McMahon, denismfmcmahon(at)gmail(dot)com
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