| Re: how to save the visitors ip addresses [message #180922 is a reply to message #180916] |
Tue, 26 March 2013 09:10   |
Tim Streater
Messages: 328
Registered: September 2010
Karma:
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Senior Member |
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In article <kir4fh$n92$1(at)dont-email(dot)me>,
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.
> Most are in between those two figures, and most of the companies with
> Class A IP blocks subdivide those and parcel them out to others. Many
> of the Class B owners do the same, and even a few of the Class C do
> (even though they only have 256 addresses).
>
>> You say, one machine, one IP. Please explain then how the ISP can
>> handle this situation."
> 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.
--
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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