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A few weeks ago I made a few ssh connections from my home PC to my college PC and the other way around. Currently I am sitting at my home PC and I am trying to figure out what was the college PC IP address. Any idea where I could find some clues?

I scanned the log files and bash history, but there was nothing obvious there.

I am running Debian Testing.

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For future reference, don't use ssh with an IP address: define an alias with a meaningful name in ~/.ssh/config. –  Gilles Jan 30 '12 at 21:50
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3 Answers

up vote 4 down vote accepted

If you're lucky, the IP address of the visited hosts can be obtained from ~/.ssh/known_hosts

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~/.ssh/known_hosts doesn't seem to be human-readable and I can't figure out which bit of it would correspond to an IP address :( –  Grzenio Jan 30 '12 at 9:52
    
What does cat known_hosts | cut -d, -f1 give you? It gives you anything in front of the first comma, which seems to contain this information. –  Bernhard Jan 30 '12 at 19:26
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@Grzenio Host names in known_hosts are hashed for privacy. You can turn this off from ~/.ssh/config (HashKnownHosts no), but it's too late for old connections. If you suspect that a name or IP address is in there but aren't sure, run ssh-keygen -F tentative-host-name. –  Gilles Jan 30 '12 at 21:49
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A very crude way would be (If it works at all)

history | grep ssh
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This will only show the last 1000 or so shell-command, so this will probably not help him. –  Bernhard Jan 29 '12 at 18:57
    
Yeah, checked this one before asking the question :( –  Grzenio Jan 30 '12 at 9:32
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last -n 20 -auser

-n for the 20 most recent logins
-a to have IP at end of line (useful if ipv6)

user to filter the username you want ...

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