auth.log showing attempted access

[Yuelin Li]

I see many entries like this in /var/log/auth.log

sshd[15144]: Failed password for invalid user josh from::ffff:89.123.234.25 port 2092 ssh2

How can I trace this computer's location?  More importantly, how can I
report this person to his/her ISP?  "host 89.123.234.25" showed that
this DNS entry can not be reversed.  Traceroute stops at
FR1-Frankfurt.teleglobe.net (80.231.64.6).  I have added iptables
rules (see http://www.debian-administration.org/articles/187) to try
to tighten SSH access.  I feel I should do something about it because
I get a few hundred entries a day coming from the same IP address.

Yuelin.

 
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