How to know the IP addresses of connected computers?

I hve a problem.
How can I know the IP address of the computers connected to a remote host without having a login in the remote host?

Ok. Weird post.

Umm.. IP addresses are clear text unless it's encrypted in a VPN tunnel. You can pick up an IP address using a packet sniffer program. But that usually requires being on the same subnet or near the subnet as having a sniffing on a backbone would generate a lot of traffic.

Plus, in some countries it'd be illegal.

You email the administrator of that host, and ask. ;)

spif, your probably on a win machine; open a command prompt and use netstat -a. that should give you everything connected to you and what port it's on. learn the netstat comands if your on a windows system, very useful.

In windows machine netstat gives all information with different switches as below

bootieofdarknes, you cant do that because this person needs to be connected to the host server to see this. he/she asked how to find out without being connected to the host, so netstat is completely out of the question, at least in my experience. i know that much but dont know how to solve your, erm...."problem"

ethernet packet sniffers (running local not port sniffer as discribed above) and most up to date firewall software can detect/monitor ip trafic too.. and they can also log it so you can see on a later point what the network layer has been doing when you were away. In case none of these were running there is no way of finding out exactly what kind of trafic, ip addresses hit your machine cause windows doesn't log it.

I hve linux loaded on to my system.
Sorry I didnt specify that.
And also I dont have any accnt in the Remote host
Thanx for the replies
I did looked for packet sniffers but can u tell me which is good for LINUX

Some of the better packet sniffers include:

TCPDump

Ethereal (has nice graphical interface)

u can try Visual Route www.icewalkers.com/softlib/app/app_01104.html .
or Ice Walker.
www.icewalkers.com/ search.php?mode=keyword&match=ip%20trace - 19k .

good luck

:)