Can you find out the IP SSH-ing your computer?

Question

If computer A SSHs computer B, can computer B find the IP of computer A? If so, how?

jmccrohan · Answer 1 · 2011-07-30 20:54:17Z

up vote 2 down vote accepted

SSH connection info is also stored in the SSH_CONNECTION environmental variable.

You should be able to view this by entering echo $SSH_CONNECTION.

answered Jul 30 '11 at 20:54

feedback

nmat · Answer 2 · 2011-07-30 03:07:20Z

up vote 4 down vote

Yes. Just run netstat:

netstat --tcp --numeric

Look for the IP using the port 22. --numeric forces netstat to show IPs and --tcp only shows TCP connections

answered Jul 30 '11 at 3:07

nmat
84319

Oh and how do I do that on a Mac? – JShoe Jul 30 '11 at 3:16

1

According to the manpage here: developer.apple.com/library/mac/#documentation/Darwin/Reference/… you should type netstat -n. There is no tcp filtering. – nmat Jul 30 '11 at 3:24

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KCotreau · Answer 3 · 2011-07-30 03:05:00Z

Yes, and here is how in Windows:

The netstat -a command shows all conections as they happen.

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I am not a Linux guru, but it is very similar, and the actual base command is the same, I believe:

MaQleod · Answer 4 · 2011-07-30 17:48:57Z

For SSH on a specific interface, you can also use

tcpdump -i interface port 22

This will work for linux and mac and if you have a tcpdump port for windows, it will work the same way.

4 Answers