At some stage you may find that you need to run the ssh daemon on multiple ports, for example so that you can have it accessable on the normal port 22 from the internal network, but obscure it from outside snoopers by running it also on a second port, allowing the normal ssh port (22/tcp) to be blocked from outside.
Here’s how to do it;

    # vi /etc/ssh/sshd_config

    Port 22

    Port 22
    Port 2222

    # /etc/init.d/sshd restart

    # netstat -anp | grep ssh