Re: ip tracing in newsgroups
From: Gladys Pump (noway.jose_at_jose.noway.zap)
Date: 03/05/04
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Date: Fri, 05 Mar 2004 16:01:10 +0000
On Thu, 04 Mar 2004 20:11:51 GMT, John <John@somewhere.com>, whilst in the
alt.computer.security newsfroup, articulated the following sentiments :
>Well I thought the OP was asking how to prevent your IP address from
>showing up on the header to the messages that you post.
He was, yes. AFAIK, the only ways to accomplish this are to use a News
provider such as Giganews (http://www.giganews.com), or Easynews, that will
remove your originating IP address from posts, or use a proxy service like
those found on http://www.cotse.net . Using 'nyms' (which AFAIK mean
'anonymous relays') would also work, although one of those relays has to
know your originating IP address. Corrections welcome.
>I believe that NAT accomplishes that, at least the IP address showing under "posting
>host" in the detailed headers for my posts is *not* my IP address. I
>don't know what address it is, but it's not mine.
The IP address I see on your post resolves to Telus Comms.
>So, my question is - can someone identify my machine from the
>information in the detailed header to my postings here - or not?
As the Colonel mentioned John, NAT does mask your LAN machines, but in the
case of all other Internet devices, all they see is your router's IP
address. That is the IP address that gets stamped onto everything you send
out onto the Internet. AFAIK, LAN IP addresses (192.168.1.xxx for example)
are not routable on the Internet.
Are you looking in your 'sent items' or 'outbox' and checking the headers
there ? If so, your machine's LAN IP address might appear there, yes. But
that address cannot exist on the Internet. All web/mail/news/whatever
services that you are connected to, only care about your router's IP
address. That is all they see. NAT just automagically translates that into a
private IP address that can exist on your LAN, and routes it to the correct
machine.
I see you are using MicroPlanet Gravity v2.50. Your newsreader may stamp the
LAN IP address on all your posts, but only you see that. I'm quite sure that
my newsreader doesn't show this, at least I can't get it to. But I'm very
sure that all posts from this machine carry this machine's LAN IP address as
far as my router, where said IP address gets replaced by the router's IP
address (the one assigned by DHCP by my ISP) so that the post can wing it's
way to Giganews.com, eventually.
Unless the News service you are subscribed to provides the 'feature' of
removing an originating IP (the router's IP, not a machine on your LAN), as
is the case with Giganews for example, then your IP address will follow
through into all postings.
To finally answer your question, yes, someone could identify your machine
from the information provided in your post's header, if it has a valid IP
address stamped on it. Of course, your News provider will most likely know
who you are all the time, and whilst they may not monitor you, they have the
means to identify you. And me ! :)
HTH.
Regs, Pete.
Never anthropomorphize computers. They don't like it.
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