Security Basics mailing list archives
Re: Private IP address with yahoo messenger
From: "Colin Copley" <colin.75 () btinternet com>
Date: Fri, 25 May 2007 18:20:40 +0100
On Tuesday 22 May 2007 11:21 pm, Alcides wrote: 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)? 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?
Yes. The internal IP addresss should go no further than a table in the NAT router so the router remembers where to send the reply. It is replaced after this point by the public IP address of the router. Perhaps Yahoo Messenger could wrap up the internal IP address and use it to create some kind of transaction ID, which it sends with the message but although I'm not familiar with the software, I'm pretty sure many have checked and cant imagine something like that going unnoticed. However Ethrereal/Wireshark will capture the packets for you to inspect and make comparisons. Remember you _will_ find your local ip address in the source field of the ip packets, but this will be swapped by the NAT device. Presumably you can send http links in Yahoo chat? Your best bet might be a java, javascript, or activeX program to grab the internal IP address and relay it. Kind regards Colin
Current thread:
- Private IP address with yahoo messenger Alcides (May 23)
- Re: Private IP address with yahoo messenger Jeff MacDonald (May 24)
- RE: Private IP address with yahoo messenger Murda Mcloud (May 25)
- Re: Private IP address with yahoo messenger Alcides (May 25)
- Re: Private IP address with yahoo messenger Jeff MacDonald (May 25)
- Re: Private IP address with yahoo messenger Colin Copley (May 25)
- Re: Private IP address with yahoo messenger aditya kuppa (May 25)
- Re: Private IP address with yahoo messenger Colin Copley (May 25)
- Message not available
- Private IP address with yahoo messenger Vivek P (May 24)
- Re: Private IP address with yahoo messenger Alcides (May 24)
- Re: Private IP address with yahoo messenger Vivek P (May 24)
- Private IP address with yahoo messenger Vivek P (May 24)
- Re: Private IP address with yahoo messenger Jeff MacDonald (May 24)
- Re: Private IP address with yahoo messenger Pingu (May 29)
- Re: Private IP address with yahoo messenger neo anderson (May 30)
- Re: Private IP address with yahoo messenger crazy frog crazy frog (May 31)
- <Possible follow-ups>
- Re: RE: Private IP address with yahoo messenger davegray99 (May 28)
- Re: Private IP address with yahoo messenger Alcides (May 30)
- Re: Private IP address with yahoo messenger Pranay Kanwar (May 30)
- Re: Private IP address with yahoo messenger John Pluffum (May 30)