nano /etc/ssh/sshd_config
Code:
Change
#Port 22
to
Port 3474
Of course I just made up 3474, pick a number of a port that is not being used, be sure to open your firewall and remove the comment character #. If your not sure about a port conflict, i.e. using a port already for something else look at the ports already open in your firewall and choose one that is not there, or search on here for firewall ports and there should be a list, again choose one not in use.
More suggestions
Code:
Protocol 2
ListenAddress 192.168.0.1
Make the listen address one of your IP's the 192.168.0.1 was just an example. This will limit what IP can ssh in which is a little more secure
Instead of allowing any of your IP's to be able to ssh.
You cpuld even make an A entry in your DNS zone ie ssh.domain.com and if you ever need to change your IP you would not have to notify your clients (because they are using ssh.domain.com) you could simply change the A record.