| Re: how to save the visitors ip addresses [message #180924 is a reply to message #180922] |
Tue, 26 March 2013 10:16   |
Jerry Stuckle
Messages: 2598
Registered: September 2010
Karma:
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Senior Member |
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On 3/26/2013 5:10 AM, Tim Streater wrote:
> 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.
>
Actually, they are by ARIN. They are then suballocated by the owners.
--
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Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
jstucklex(at)attglobal(dot)net
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