| Re: how to save the visitors ip addresses [message #180928 is a reply to message #180927] |
Tue, 26 March 2013 11:47   |
Tim Streater
Messages: 328
Registered: September 2010
Karma:
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Senior Member |
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In article <1928083(dot)5czRgZtFYk(at)PointedEars(dot)de>,
Thomas 'PointedEars' Lahn <PointedEars(at)web(dot)de> wrote:
> Tim Streater wrote:
>
>> Jerry Stuckle <jstucklex(at)attglobal(dot)net> wrote:
>>> Sure, the ISP is assigned a block of IPs. But the ISP may have as
>>> little as 1 IP assigned, or as many as 16 million out of the same block.
>>> […]
>>> The ISP would have to have 200K IPs. This could be part of a Class A
>>> block or multiple Class B blocks. But if they have 500,000 customers,
>>> they will definitely have more than one Class B block. However, they
>>> would not need 500,000 IP addresses - that's what DHCP is really about.
>>> Assign the IP address only when it is needed.
>>
>> Why are you talking about Class A, B, or C? These are concepts that were
>> abandoned in the 90s, with the introduction of CIDR. It's true that
>> prior to that, blocks were allocated in that way, but not any longer.
>
> Classless Inter-Domain Routing (CIDR) did _not_ supersede class-based IP
> address ranges in 1993. However, that is also one reason why IPv4 addresses
> are about to run out [1], why registries are beginning to assign non-class-
> based ranges [2], and why ultimately migration to IPv6 is important to the
> continued operation of the Internet.
What do you mean "beginning to". Don't talk cock. It's been the case
since the 90s that space has *not* been allocated on the old class
basis. When making a request to as it might be RIPE, you might end up
being allocated a /24 (old style class C) or a /16 (old style class B)
but that was just a coincidence. A /21 was a likely request (IIRC, it's
been 6 or 7 years since I was making such requests).
--
Tim
"That excessive bail ought not to be required, nor excessive fines imposed,
nor cruel and unusual punishments inflicted" -- Bill of Rights 1689
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