+Client
+======
+On a machine at home, or which other IP you want to dyndns, setup a new ssh key
+as one of your users::
+
+ $ mkdir ~ssh-dyndns
+ $ cd ~/ssh-dyndns
+ $ ssh-keygen -N "" -C "dyndns@home.example.org" -f ~/ssh-dyndns/ssh-dyndns_rsa
+
+Copy the contents of the public key (``ssh-dyndns_rsa.pub``) into
+``/home/dyndns/.ssh/authorized_keys`` on your server.
+
+Run the next command manually to confirm the new ssh key::
+
+ $ cd ~/ssh-dyndns/ && ssh -i ssh-dyndns_rsa dyndns@example.org home.example.org
+
+If that worked, and you DNS entry worked, add the command to cron::
+
+ $ crontab -e
+ # update dns entry home.example.org every 5 minutes
+ */5 * * * * cd /home/$user/ssh-dyndns/ && ssh -i ssh-dyndns_rsa dyndns@example.org home.example.org
+
+