tightening ssh

[LC]

> 1. Most of these are done by script kiddies.  They get a script and
> run it is tries to connect via standard port 22.
>
> 2 Defense in depth.
>
> A. Non-standard port.
> B. Only allow users that require login via ssh which should never be root.
> C. Require key login no passwords.
> D. use sudo and sudrestrictions to prevent loading a shell as root.

I changed the port to 6000, restart sshd /etc/init/sshd restart and login 
via new port 6000 sucessfully. But it takes a longer time to process a 
command.

eg. default port 22
ps aux takes 2 sec

on port 6000
ps aux takes 45 sec.

What happened?

regards