Re: IP number question
From: Walter Roberson (roberson_at_ibd.nrc-cnrc.gc.ca)
Date: 01/27/05
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Date: 27 Jan 2005 16:39:58 GMT
In article <6d0Kd.10797$rw.4141@fed1read04>,
Michael J. Pelletier <mjpelletier@mjpelletier.com> wrote:
|Walter Roberson wrote:
|> but I can assure you with 100% certainty that my message
|> was NOT posted to the groups.google.com news server, and that
|> that IP address has no special article exchange arrangement
|> with google. I'm quite certain of that -- I administer the system
|> in question myself, and I administer the company firewall myself.
|> There is NO direct way from 192.70.172.31 to google's posting
|> service.
|Not sure what you are saying. Your IP (via the last post) is 192.70.172.31.
|The IP block is owned by the Canadian Gov and your IP goes to a Institute
|of Biodiagnostics of Canada. I assume that is where you posted the last
|message.
|Now your statement is that there is no way your IP address can be used to
|post news articles?
What I am pointing out is that my system has no direct connection to
google's posting service, and so it is not possible for google
to have -directly- received the posting from my system. Therefore google
cannot have "firsthand" knowledge of the IP address that I was posting
from: it has to rely on something else to tell it the IP address
that was used. And that something else relies on something else yet,
and so on down the chain. If I can find any system anywhere in the
world that is willing to trust me when I send IHAVE verbs, then
I can present a posting whose headers *claim* whatever IP address
I care to insert. The next hop will copy the forged header, the
hop after that will too, and so on until it gets to google or your
news server and you retrieve the message and thus display the
header that I injected rather than where the posting really came from.
--
Aleph sub {Aleph sub null} little, Aleph sub {Aleph sub one} little,
Aleph sub {Aleph sub two} little infinities...
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