ssh newbie

Hi everyone. How do I ssh into a machine on a lan at IP 192.168.1.1 when the IP the ISP assigns to our server for internet connections varies? I've opened up the ssh port using Yast2 on the lan machine and I can traceroute to get the current IP of the server as we have a domain name, call it a.b.c.d I issue ssh -l steve a.b.c.d but get the error: ssh: connect to address a.b.c.d port 22: Connection refused Or maybe I can't do it? Thanks, Steve.