| Re: how to save the visitors ip addresses [message #180933 is a reply to message #180888] |
Wed, 27 March 2013 05:29   |
Richard Damon
Messages: 58
Registered: August 2011
Karma:
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On 3/25/13 8:42 AM, Tim Streater wrote:
> In article <kipfqa$ib5$1(at)dont-email(dot)me>,
> Jerry Stuckle <jstucklex(at)attglobal(dot)net> wrote:
>
>> You can't track visitors by IP. A visitor's IP can change at any
>> time, and it is very possible to have multiple visitors from the same
>> IP address (i.e. even at my home we have 5 computers but only 1 IP
>> address). An IP is valid for one conversation (i.e. a page request
>> with all of it's images) but nothing more.
>
> 1) In both instances above you mean "e.g." and not "i.e."
>
> 2) In the above, "its" does not need an apostrophe (are you a grocer?)
>
> 3) A user's IP address is typically allocated when they reboot their
> ADSL router (e.g. mine has been up for 128 days), and will remain
> unchanged for that duration. Unless, that is, they asked their ISP for a
> static IP address in which case it won't change at all.
>
> 4) So even with a dynamic IP address, to say that it's valid for one
> page request only is complete nonsense.
>
I have seen some setup were the user was given a private space IP
address, which the ISP would NAT out through a /24 (or bigger) block of
addresses. Under this situation, the IP address might not be stable for
an entire page request, as when the browser opens up a second channel
for an image, this could be mapped to a different IP address in the
block. This setup was more common with dial up, but may become more
common for residential access as a way to preserve IP space to delay the
need to move the residence to IPv6.
This method does give some issues with web sites that protect from
session hijacking by checking for IP addresses. Some application I use
specifically allow for this check to be set to only match part of the IP
address.
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