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Re: Lookup zip by IP address [message #172975 is a reply to message #172974]

Mon, 14 March 2011 13:54

The Natural Philosoph
Messages: 993
Registered: September 2010

Karma:

Senior Member

Roy Smith wrote:
> 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.

Not always, as I understand it.

http://en.wikipedia.org/wiki/HTTP_persistent_connection

However, such connections time out fairly quickly. So if you take more
than a couple of minutes to read - say - a page before moving on, you
get a new connection.

I think the idea is that when you hit a site with - say - a load of
images and css files you use just one connection to pull the lot down,
rather than multiple ones.

Thus preventing massive spawning of parallel processes at the far end.

But that's guesswork.

> On a host with
> multiple interfaces (or a mobile host),

Or a DHCP client that goes 'off line' briefly..

> 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 :-)

I think that's pretty clear. :-)

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[Message index]

		Lookup zip by IP address By: laredotornado@zipmail on Mon, 10 January 2011 18:29
		Re: Lookup zip by IP address By: Michael Fesser on Mon, 10 January 2011 18:36
		Re: Lookup zip by IP address By: Heiko Richler on Mon, 10 January 2011 18:52
		Re: Lookup zip by IP address By: Twayne on Mon, 10 January 2011 20:44
		Re: Lookup zip by IP address By: Captain Paralytic on Mon, 10 January 2011 22:02
		Re: Lookup zip by IP address By: Twayne on Mon, 17 January 2011 20:46
		Re: Lookup zip by IP address By: Thomas 'PointedEars' on Sat, 12 March 2011 01:57
		Re: Lookup zip by IP address By: Jerry Stuckle on Sat, 12 March 2011 03:13
		Re: Lookup zip by IP address By: D. Stussy on Sat, 12 March 2011 07:32
		Re: Lookup zip by IP address By: Thomas 'PointedEars' on Sat, 12 March 2011 08:37
		Re: Lookup zip by IP address By: Jerry Stuckle on Sat, 12 March 2011 13:21
		Re: Lookup zip by IP address By: Roy Smith on Sat, 12 March 2011 14:16
		Re: Lookup zip by IP address By: Jerry Stuckle on Sat, 12 March 2011 15:02
		Re: Lookup zip by IP address By: me on Sat, 12 March 2011 16:35
		Re: Lookup zip by IP address By: The Natural Philosoph on Sat, 12 March 2011 16:59
		Re: Lookup zip by IP address By: Jerry Stuckle on Sat, 12 March 2011 19:02
		Re: Lookup zip by IP address By: me on Sat, 12 March 2011 23:28
		Re: Lookup zip by IP address By: Jerry Stuckle on Sun, 13 March 2011 02:33
		Re: Lookup zip by IP address By: Luuk on Sun, 13 March 2011 14:58
		Re: Lookup zip by IP address By: Jerry Stuckle on Sun, 13 March 2011 17:32
		Re: Lookup zip by IP address By: Luuk on Sun, 13 March 2011 17:46
		Re: Lookup zip by IP address By: Jerry Stuckle on Sun, 13 March 2011 19:35
		Re: Lookup zip by IP address By: spambait on Sun, 13 March 2011 21:52
		Re: Lookup zip by IP address By: The Natural Philosoph on Sun, 13 March 2011 21:28
		Re: Lookup zip by IP address By: Jerry Stuckle on Sun, 13 March 2011 21:37
		Re: Lookup zip by IP address By: Twayne on Mon, 14 March 2011 15:51
		OT Re: Lookup zip by IP address By: Twayne on Mon, 14 March 2011 15:49
		Re: OT Re: Lookup zip by IP address By: The Natural Philosoph on Mon, 14 March 2011 17:17
		Re: OT Re: Lookup zip by IP address By: Twayne on Tue, 15 March 2011 15:17
		Re: Lookup zip by IP address By: Twayne on Mon, 14 March 2011 15:40
		Re: Lookup zip by IP address By: me on Mon, 14 March 2011 02:12
		Re: Lookup zip by IP address By: Jerry Stuckle on Mon, 14 March 2011 02:42
		Re: Lookup zip by IP address By: Twayne on Mon, 14 March 2011 16:02
		Re: Lookup zip by IP address By: Jerry Stuckle on Mon, 14 March 2011 16:07
		Re: Lookup zip by IP address By: The Natural Philosoph on Mon, 14 March 2011 02:49
		Re: Lookup zip by IP address By: spambait on Mon, 14 March 2011 04:20
		Re: Lookup zip by IP address By: Twayne on Mon, 14 March 2011 15:54
		Re: Lookup zip by IP address By: Twayne on Mon, 14 March 2011 15:39
		Re: Lookup zip by IP address By: spambait on Sat, 12 March 2011 23:13
		Re: Lookup zip by IP address By: Twayne on Sat, 12 March 2011 19:19
		Re: Lookup zip by IP address By: Twayne on Sat, 12 March 2011 19:17
		Re: Lookup zip by IP address By: Twayne on Sat, 12 March 2011 19:14
		Re: Lookup zip by IP address By: Thomas 'PointedEars' on Sun, 13 March 2011 23:45
		Re: Lookup zip by IP address By: Jerry Stuckle on Sat, 12 March 2011 13:16
		Re: Lookup zip by IP address By: Michael Fesser on Mon, 14 March 2011 11:23
		Re: Lookup zip by IP address By: The Natural Philosoph on Mon, 14 March 2011 13:29
		Re: Lookup zip by IP address By: Roy Smith on Mon, 14 March 2011 13:40
		Re: Lookup zip by IP address By: The Natural Philosoph on Mon, 14 March 2011 13:54
		Re: Lookup zip by IP address By: Roy Smith on Mon, 14 March 2011 23:50
		Re: Lookup zip by IP address By: The Natural Philosoph on Tue, 15 March 2011 00:25
		Re: Lookup zip by IP address By: Tobiah on Thu, 07 April 2011 17:01
		Re: Lookup zip by IP address By: The Natural Philosoph on Tue, 11 January 2011 11:25
		Re: Lookup zip by IP address By: Twayne on Mon, 17 January 2011 20:48
		Re: Lookup zip by IP address By: Captain Paralytic on Mon, 10 January 2011 22:05
		Re: Lookup zip by IP address By: Romia Super on Tue, 18 January 2011 09:27

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