Re: kernel.org status: hints on how to check your machine for intrusion

David Miller
2011-10-01T18:14:22Z

From: Steven Rostedt <rostedt@goodmis.org>
Date: Sat, 1 Oct 2011 14:06:41 -0400

> For my machine that is connected to the outside world, I have a script
> that runs every night that checks for attacks. As bots constantly look
> for port 22 and 80, they find my machine without issue. When my script
> detects a bunch of ssh login attempts that fail, it will add that ip
> address to the iptables DROP chain:

By running sshd on a different port, you'll avoid the login attempts
as well as the overhead of the successful connection attempts.

I haven't allowed sshd to run on port 22 in more than 10 years.