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Re: Lookup zip by IP address [message #172974 is a reply to message #172972] Mon, 14 March 2011 13:40 Go to previous messageGo to previous message
Roy Smith is currently offline  Roy Smith
Messages: 11
Registered: November 2010
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In article <9iurn6pkg5iifq39ii9isstrqb7f8ncc95(at)mfesser(dot)de>,
Michael Fesser <netizen(at)gmx(dot)de> wrote:

> .oO(D. Stussy)
>
>> "Jerry Stuckle" <jstucklex(at)attglobal(dot)net> wrote in message
>> news:ileocv$pkg$1(at)news(dot)eternal-september(dot)org...
>>>
>>> IP addresses can change as often as every transmission, or as seldom as
>>> almost never. They are not reliable.
>>
>> Every transmission: No.
>> Every SESSION: Yes.
>>
>> One cannot have TCP sessions when it changes every transmission.
>
> Every single request may come from a different IP address. Sessions have
> nothing to do with TCP and are not bound to a particular IP address.

The concept of "session" (in the context of the ISO 7-layer model) is
somewhat vaguely defined, but in general I would agree with this
statement.

Most web applications maintain some state in a browser cookie which they
use to establish session continuity across multiple HTTP requests. Each
of those HTTP requests uses a new TCP connection. On a host with
multiple interfaces (or a mobile host), each of those TCP connections
could come from a different IP address.

Since HTTP sits on top of TCP, there is some logic to calling HTTP the
ISO session layer, but that's a bit warped. Certainly, the maintaining
of web application sessions via browser cookies is not something which
is part of HTTP itself. If you were to try to crowbar it into the ISO
model, it would really fall into some higher level, but such attempts
are usually futile.

As for the statement, "IP addresses can change as often as every
transmission", it's hard to say whether that's correct or not without
knowing how you're defining "transmission". If by "transmission", you
mean "HTTP request", then yes, it's correct. If you mean "TCP packet",
then no, it's not correct. If you mean something else, then I have no
idea if it's correct or not until I know what that something else is :-)
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