how to update a lan by ftp

We have all 8.1 servers and clients. I have the 8.2 dvd1 mounted under /srv/ftp/pub and the clients can see it. Yast can also see it. I choose yast>system update. The dvd on the server whirrs away and there is a message that 450 packages have been updated after about 30 minutes. I reboot the client and everything is the same 8.1 I had before. What am I doing wrong? The ftp instructions on the suse site have been down for 2 days now. Thanks, Steve.