If this were a denial of service attack, you'd be seeing those 15k messages covering less than an hour -- probably far less.  This is just the botnet-based brute-force attack on SSH passwords that constitutes part of the "background noise" of the Internet.

Make sure you're using strong passwords (or better yet, key-based authentication) and that you've disabled root login over SSH, and don't worry about it.

Can this be a DoS Attack?
My daughter loves drawing - using pencil.  She wants to be a Graphic Designer - mainly for video games area.  We got her a drawing tablet, but she is more comfortable using the pencil.  I have not idea if GD is the best thing for her, &amp;/or how I can help her.  Are there any events, seminars, she could attend to?  She is in 10th grade now... I want to make sure this is really what she wants to do. I don't want her to realize later on, it is not really what she thought she was going into.  

Thank you
B
