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Darren New wrote:
> Invisible wrote:
>> IP is different. It's designed to work for large networks.
>
> And SONET and ATM and X.25 and ISDN aren't? Do you even know what those
> networks are?
Last time I checked, ISDN is point-to-point only (i.e., the smallest
possible kind of network). I was under the impression that ATM is as
well, but I haven't actually used ATM.
> Here's a hint: When you phone America from the UK, your voice is not
> traveling over IP. Heck, the busy signal isn't traveling over IP either.
I try to avoid phoning America. It's almost impossible to hear what the
other person is saying. (Why this would be the case in a digital system
is beyond me...)
>> Sure, you don't usually talk to them directly; usually you use one of
>> the IP addresses from the block assigned to your ISP.
>
> Ding ding! Guess what? They aren't assigned centrally. Your ISP assined
> you yours, mine assigned me mine.
And where does the ISP get their IP block from?
Yeah, exactly: They're assigned centrally.
>> But my point is,
>> you can't just pick a random number out of the air and try to use that
>> as your IP address. It won't work.
>
> That's a different statement from "they're assigned centrally."
>
> And yes, actually, you can. You'll break other people, but it'll work if
> you do it right.
If I just pick an IP address at random, it won't even route correctly.
Oh, sure, if I'm building a *private* network not connected to anything
else, I can use whatever addresses I want. (Hell, I don't even have to
use IP.) But then everybody on *that* network needs centrally-assigned
addresses...
--
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*
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