Security Basics: Re: Private IP address with yahoo messenger

[Alcides <alcides.hercules () gmail com>]

Thanks Jeff.

Let me give you a slight insight of a real scenario.
I don't know how it was done. But I have witnessed that someone from 
other end in Yahoo chat has told my internal IP to me -more than once.
-->I'm sure that person is geographically separated at least 1000Miles.
-->I never told my internal IP to anybody by any means.
-->I have ensured that I changed my private IP every time it was 
reported to me in chat session.
-->No file transfer/ voice/ video was involved.
-->I have ensured absence of any keylogger/ Spyware in my PC.
-->Every time, Yahoo messenger was the only channel, with which I was 
communicating with world.
Is it some kind of messenger related tool? Or some packet analysis 
utility or something else? I tried googling around a lot but couldn't 
much except file transfer related trick. But that couldn't help at all.
Now what can you suggest to carry out my research in proper direction so 
that I can Find answers to both of my questions in the earlier post?
Regards.

Jeff MacDonald wrote:
> On Tuesday 22 May 2007 11:21 pm, Alcides wrote:
> > Hi list,
> > I was wondering to have any clue on this.
> > While having a chat session with somebody in yahoo messenger, how is
> > it possible to obtain his/her Private IP address if that person is
> > behind a Router and/or a Firewall (NATed)?
> not without the person giving it to you.. i.e. I know of no way to obtain that 
> information without getting it directly from the user.
> > Moreover,
> > Is there any way that he/she can hide successfully (behind the NAT or
> > something else)so that NO internal IP address is revealed?
> as far as I know, that is already the case-- as a user you have no way of 
> getting ip address information, especially the private side.
> of course it prolly depends on the protocol and the implementer of the 
> service.
> > Thanks.
> > Warm regards.
> hope that helps a little
>
> regards,